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  • Awaiting the signal to attack
    Awaiting the signal to attack
  • WordNet 3.6
    • n signaling any nonverbal action or gesture that encodes a message "signals from the boat suddenly stopped"
    • ***

Additional illustrations & photos:

The Signal Corps The Signal Corps
Wig Wag Signalling Wig Wag Signalling
Signals that Guards our Coast Signals that Guards our Coast
The Signal of Distress that was Never Seen The Signal of Distress that was Never Seen

Century Dictionary and Cyclopedia
  • Interesting fact: Toronto was the first city in the world with a computerized traffic signal system
    • n signaling The use of signals; in railroading, the business of controlling the traffic by means of signals. In block-signaling, signals are placed at the beginning of every one of the continuous series of blocks into which a railroad is divided. There are various methods of controlling the signals. In the telegraph block-signaling system they are controlled by a signalman stationed at the beginning of the block, who receives information by telegraph from the signalman in the block next above him, in the direction of travel, and sends information to the one next below him. If the next train ahead is reported to have cleared the block and proceeded to the next block in advance, the signalman displays his signal at ‘clear.’ If not, he detains the following train by displaying his signal at ‘danger’ until the block is reported clear. In the controlled manual system the signals are operated by hand by each signalman in coöperation with the signalman next in advance, by an electric circuit on the telegraph-pole line running between block-stations and sometimes supplemented by an electric circuit through the rails, each train shunting the circuit through its wheels and thereby controlling the signals or block-signal apparatus. In the automatic system, signals on masts or brackets are operated through an electric current which traverses the rails, the train, through its wheels, shunting the current when occupying these track-circuits, thus indirectly opening the signal-controlling circuits. Each track-circuit is connected with the signals at the beginning of each block, and a train entering the block sets the signal automatically at ‘danger’ and maintains it there until the rear end of the train has entered the next block, when the danger-signal is released and shows that the line is clear. This applies to the home signals, the distant signals, though on the same mast, being controlled by a much longer rail-circuit and remaining at ‘caution’ until after the home signal on its own post as well as the next home signal in advance has come to clear. Various methods are employed to move the signals under the control of the rail-circuits. The interlocking system of signals is one which is adapted to the movements of trains at stations, at crossovers, and in yards; its operation includes the control of the switches, the signals being displayed as the result of the switch-movements, reporting the position of the switches and permission to proceed to the train-crews. Several methods of thus controlling the movements of switches and signals are employed upon American roads. In the mechanical system all the switches and signals of a yard are operated from a switch-tower through the movement of hand-levers, each lever opening and closing one switch or operating one signal. The movement of the lever is transmitted to the switch by means of long rods (pipes joined together by screw-couplings) resting on roller-bearings with a bell-crank at each change of direction. Each lever opens or closes the switch and, through the interlocker, locks other levers of the system and prevents any signal from being displayed except that which shows the track-connection to be clear at that point, and leaves all other signals governing conflicting routes at danger until the next switch-movement is made. This mechanical system is limited, in point of distance, by the ability of the signalman to move a switch by means of a rod, or a distant signal by means of a long wire. The pneumatic system employs air-motors placed at each switch and signal to operate it, each air-motor being operated by compressed air supplied through small pipes which extend from the switch-tower to each switch and which are fed from a main feed-pipe that is kept supplied by a compressor placed at some central point in the system. A movement of the hand-lever in the tower admits air to the motor through a small pipe, and the completion of the movement of the apparatus is reported back through a second pipe to indicate to the signalman that the switch has moved and that the proper signal can be displayed to lock all conflicting routes. To change the switch or signal, air is admitted to other pipes by the movement of the lever, and the switch and signal are reversed and their reversal reported back. In the electropneumatic system, compressed air is employed to operate the switches and signals, the control being by means of electric circuits (through wires underground) connecting the tower with each switch and signal. The movement of a lever in the tower sets the motors at the switches and signals in motion, reporting back their movement, interlocking all signals, and, when required, reversing all switch and signal movements. In the electric system the switches and signals are operated by electric motors placed at each switch and signal and fed by storage-batteries, the control from the tower being by electric circuits. Compare signal, 2.
    • ***


  • Oliver Wendell Holmes
    “Stillness and steadiness of features are signal marks of good breeding. Vulgar persons can't sit still, or at least must always work their limbs and features.”
  • John Updike
    “For male and female alike, the bodies of the other sex are messages signaling what we must do -- they are glowing signifiers of our own necessities.”
  • A. H. K. Boyd
    A. H. K. Boyd
    “There are important cases in which the difference between half a heart and a whole heart makes just the difference between signal defeat and a splendid victory.”
  • Source Unknown
    Source Unknown
    “If a woman driver ahead of you signals a left turn, be careful, she may turn left.”
  • Napoleon Hill
    “When defeat comes, accept it as a signal that your plans are not sound, rebuild those plans, and set sail once more toward your coveted goal.”
  • Dorothy Sarnoff
    Dorothy Sarnoff
    “Never try to look into both eyes at the same time. Switch your gaze from one eye to the other. That signals warmth and sincerity.”


In literature:

No other ship could be signalled.
"Gallipoli Diary, Volume 2" by Ian Hamilton
A system of signals both for the other side and for any of their scouts who may have crossed to this.
"The Long Roll" by Mary Johnston
Even as the boys watched, the commandant gave a signal and the sailors began hauling upward on the two heavy ropes.
"The Brighton Boys in the Radio Service" by James R. Driscoll
Electric light laid on to all these quarters, and to the Brigade office and the signallers' underground chamber.
"Pushed and the Return Push" by George Herbert Fosdike Nichols, (AKA Quex)
A minute later the signal came for the officers to seat themselves.
"Dave Darrin on Mediterranean Service" by H. Irving Hancock
Ned gave the signal for a halt here.
"Boy Scouts on Hudson Bay" by G. Harvey Ralphson
Evans looked at Quinn and gave a signal.
"The Pirate of Panama" by William MacLeod Raine
Look here, Roy, do you know Eliot's finger signals to the pitcher?
"Rival Pitchers of Oakdale" by Morgan Scott
As she passed, none of the other craft made signals.
"Dave Darrin After The Mine Layers" by H. Irving Hancock
Many also remained in their homes, ready for the signal to flock to his standard.
"Our Soldiers" by W.H.G. Kingston
Say, they look like the danger signals in the New York subway!
"Baseball Joe in the Big League" by Lester Chadwick
It was really with a sigh of relief from the suspense that the boys awaited the signal for their term of duty on the bridge.
"The Boy Volunteers with the Submarine Fleet" by Kenneth Ward
Heyward abandoned every hope, with the belief it was the signal that they were discovered.
"The Last of the Mohicans" by James Fenimore Cooper
He explained that Nathaniel knew the signals of the Annawan band, and would be a good decoy.
"Boys' Book of Frontier Fighters" by Edwin L. Sabin
Arnold, who was in the after-saloon at the time, heard the signal, and hurried forward to the look-out.
"The Angel of the Revolution" by George Griffith
He touched Rick's arm and signaled a stop.
"The Wailing Octopus" by Harold Leland Goodwin
Why didn't someone think of signaling him that he had been seen?
"The Scarlet Lake Mystery" by Harold Leland Goodwin
He could see where the pulsed signals gradually disappeared into a much stronger, steady 21-centimeter signal.
"The Egyptian Cat Mystery" by Harold Leland Goodwin
Piano signals should be arranged so that a signal given in a certain way always means the same thing.
"Training the Teacher" by A. F. Schauffler
They were evidently answers to the signal he had sounded.
"The Maroon" by Mayne Reid

In poetry:

"Here it has been my chosen lot,
Some awful years to spend!
Few months have pass'd, since near this spot
I gain'd this signal friend."
"The Hermit's Dog" by William Hayley
O happy souls! that soft go sailing, sailing,
Over an unknown sea,
Send some signal of your wafting, wandering,
Across the hills to me!
"Land-Bound" by Elizabeth Stuart Phelps Ward
The master’s silent signal stays
The wearied cavalcade;
The coachman reins his smoking bays
Beneath the elm-tree’s shade.
"Agnes" by Oliver Wendell Holmes
"Not where they seem their signals fly,
Their voices while we listen die;
We cannot keep, however fleet,
The quick time of their winged feet.
"The Seeking Of The Waterfall" by John Greenleaf Whittier
Faith asks no signal from the skies,
To show that prayers accepted rise;
Our Priest is in the holy place,
And answers from the throne of grace.
"O God, Who didst Thy will unfold" by Josiah Conder
I thanked him with a faltering tongue;
I thanked him with a flowing heart.
``This for the poor.'' His hand I wrung,
And gave the signal to depart.
"At The Gate Of The Convent" by Alfred Austin

In news:

Gas leak shuts down Thornton Avenue in Dalton, Ga. W Road on Signal Mountain closed tomorrow morning.
Regardless of where modulation of the carrier takes place, it is essential that the amplifying stage produces a clean, linearly amplified signal.
In the railway attack, the anarchists said all they needed to do was lift up concrete slabs to gain access to the signal technology.
The stench of bribery at Siemens signals a wider rot in Europe.
Global warming can signal bad news for the Baltic ecosystem.
Eight months after they peaked, stocks dropped to the threshold of a bear market, another signal of the mounting challenges that lie ahead for the economy, government and investors.
Searching for a signal about how consumers will spend their discretionary dollars.
Dortmund, Germany – Robert Lewandowski helped Borussia Dortmund close the gap at the top of the Bundesliga table on Saturday, scoring twice in the club's 3-1 defeat of Greuther Furth at Signal Iduna Park.
Community Green Briar traffic signal to activate.
Plants Use Volatile Signaling Compounds to Fend Off Attack and Possibly Warn Nearby Plants.
The phrase signaled a change in the tone and tenor of the civil rights movement.
Those signals were analyzed in both the frequency and time domains to obtain heart-motion features.
New chinstrap signals possible concussion.
Understanding the inner workings of modern direct digital synthesizers helps their deployment for advanced waveform generation, including the control of linear FM or chirp signals.
Deputies following a security signal on a stolen motorcycle found a garage containing other motorcycles and parts Thursday night.

In science:

Within the CDS the signals are combined such that for each quadrant photodiode longitudinal phase information, differential wave-front sensing (DWS) signals for pitch and yaw, differences of left and right as well as bottom and top of the DC photodiode signals, and the interferometric contrast are available.
Suspension platform interferometer for the AEI 10\,m prototype: concept, design and optical layout
We used the word “similar” because the signals or their duration usually have amplitudes much smaller than those of typical binary stars, and the detection of these signals has required very specific developments either from the instrumental or from the signal analysis point-of-view.
The impact of Gaia and LSST on binary stars and exo-planets
D ˆOE (t) cos(ω t) dt The extended periodical function, represented by the DCT of the signal, has discontinuities in the first derivative, unless the first derivative of the signal is 0 at the boundaries of the signal (see Fig. 3.7).
Quantum Optimal Control Theory of Harmonic Generation
Another class constitutes signals in “shift-invariant subspaces.” These signals are composed of a superposition of shifted ‘generator’ functions (e.g., splines or wavelets); see for a nice overview of this signal class.
A Constrained Random Demodulator for Sub-Nyquist Sampling
In and, this signal model is shown to provide an alternative to the bandlimited signal model; in particular, it allows the reconstruction of signals belonging to Sobolev spaces with an approximation error that scales polynomially with the sampling period.
A Constrained Random Demodulator for Sub-Nyquist Sampling
The analysis in in this regard also relies on the input signals conforming to a random signal model: given the signal model (1), the index Ω is a set of S tones drawn uniformly at random from the set of W possible tones.
A Constrained Random Demodulator for Sub-Nyquist Sampling
It also provides stable recovery even if the signal is not exactly sparse, but is well-described by a sparse signal (so-called compressible signals) [29, Theorem 2].
A Constrained Random Demodulator for Sub-Nyquist Sampling
However, if we use an MRS within the CRD and the input signal is statistically more likely to contain low frequencies, then this additional knowledge about the signal can be leveraged to improve the reconstruction averaged over many signals and random waveform realizations.
A Constrained Random Demodulator for Sub-Nyquist Sampling
This is partly because the (generally unknown) operator that models the transmission of an acoustic signal through a section of layered earth has a very special property: it maps minimum phase signals to delayed minimum phase signals.
The structure of test functions that determine weighted composition operators
Examples include the inspiral signal from a Neutron Star binary, the merger signal from two colliding black holes, and stochastic signals from processes in the early Universe.
Gravitational Wave Astronomy: Needle in a Haystack
Figure 1: a) Phase sensitive gain in a degenerate OPO – the amplitude incremental gain of the signal (g|s| ) versus the relative phase between the pump and the signal – (θs = φs − φ p /2 + π /4, where φs and φ p are the signal and pump phases, respectively), b) Schematic of the all-optical quantum RNG.
All-Optical Quantum Random Bit Generation from Intrinsically Binary Phase of Parametric Oscillators
We note that the very first cut of significant signals is done based on the signal to noise ratio (SN R) of the highest periodogram peak, and not by the SNR of the proposed signal.
An Independent Planet Search In The Kepler Dataset. I. A hundred new candidates and revised KOIs
We see that these signals are lost not simply because precessingbinary signals are very different from non-precessing-binary signals.
Towards models of gravitational waveforms from generic binaries: A simple approximate mapping between precessing and non-precessing inspiral signals
It is worth noting that the signals in figures 7 and 8 are acquired at the output of the sampling scope: the displayed signals are obtained as the superposition of dots from several output signals, while the sampling trigger was synchronized with the step generator.
CLARO-CMOS, a very low power ASIC for fast photon counting with pixellated photodetectors
But if both the go and the return signal are defined in the same reference frame and at the same - possibly supraluminal - speed v, then the “return” signal will necessarily arrive in the absolute future of the start of the “go” signal.
Quantum correlations in Newtonian space and time: arbitrarily fast communication or nonlocality