signal

1. Any nonverbal action or gesture that encodes a message (synset 106804229)
   "signals from the boat suddenly stopped"
   is a type of: communication - something that is communicated by or to or between people or groups
   subtypes:

   • recording - a signal that encodes something (e.g., picture or sound) that has been recorded
   • number, phone number, telephone number - the number is used in calling a particular telephone
   • start, starting signal - a signal to begin (as in a race)
   • storm signal - a signal announcing the approach of a storm (particularly a storm of marked violence)
   • beam, radio beam - a signal transmitted along a narrow path; guides airplane pilots in darkness or bad weather
   • ticktack - system of signalling by hand signs used by bookmakers at racetracks
   • time signal - a signal (especially electronic or by radio) indicating the precisely correct time
   • dog-ear - a corner of a page turned down to mark your place
   • animal communication - communication between animals (of the same species)
   • alarm, alarum, alert, warning signal - an automatic signal (usually a sound) warning of danger
   • distress call, distress signal - an internationally recognized signal sent out by a ship or plane indicating that help is needed
   • all clear - a signal (usually a siren) that danger is over
   • bugle call - a signal broadcast by the sound of a bugle
   • curfew - a signal (usually a bell) announcing the start of curfew restrictions
   • retreat - (military) a signal to begin a withdrawal from a dangerous position
   • drumbeat - (military) the beating of a drum as a signal for lowering the flag at sundown
   • radiotelegraphic signal, telegraphic signal - a signal transmitted by telegraphy
   • whistle, whistling - the act of signalling (e.g., summoning) by whistling or blowing a whistle
   • high sign - a silent signal of warning or recognition
   • symbol - an arbitrary sign (written or printed) that has acquired a conventional significance
   • visual signal - a signal that involves visual communication
   • indicator - a signal for attracting attention
   • electronic signal - a signal generated by electronic means
   • radio beacon - a characteristic signal emitted by a transmitter used for navigation
   • input, input signal - signal going into an electronic system
   • output, output signal - signal that comes out of an electronic system
   same as: sign, signaling
2. Any incitement to action (synset 109208177)
   "he awaited the signal to start"; "the victory was a signal for wild celebration"
   is a type of: incitation, incitement, provocation - something that incites or provokes; a means of arousing or stirring to action
3. An electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes (synset 111467415)
   is a type of: electrical energy, electricity, power - energy made available by the flow of electric charge through a conductor
   subtypes: interrupt - a signal that temporarily stops the execution of a program so that another procedure can be carried out

1. Notably out of the ordinary (synset 301289243)
   "the year saw one signal triumph for the Labour party"
   similar to: impressive - making a strong or vivid impression

1. Communicate silently and non-verbally by signals or signs (synset 201041202)
   "He signed his disapproval with a dismissive hand gesture"; "The diner signaled the waiters to bring the menu"
   is a type of: communicate, intercommunicate - transmit thoughts or feelings
   subtypes:

   • wigwag - signal by or as if by a flag or light waved according to a code
   • semaphore - send signals by or as if by semaphore
   • heliograph - signal by means of a mirror and the using the sun's rays
   • flag - communicate or signal with a flag
   • whistle - give a signal by whistling
   same as: sign, signalise, signalize
2. Be a signal for or a symptom of (synset 200923271)
   "These symptoms indicate a serious illness"; "Her behavior points to a severe neurosis"; "The economic indicators signal that the euro is undervalued"
   is a type of: tell - let something be known
   subtypes:

   • augur, auspicate, betoken, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage, prognosticate - indicate, as with a sign or an omen
   • mark - designate as if by a mark
   same as: bespeak, betoken, indicate, point

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