signal flag
Ship's visual message
A signal flag is a flag used to communicate messages, especially at sea.
Ships use standardized sets where each flag represents a letter, number, or meaning—flown singly or in combination to spell words or convey standard messages: The vessel raised signal flags requesting a pilot.
Signal flags also appear in racing to indicate starts, cautions, or disqualifications.
- pennantTapering nautical flag
- signalmanOne directing traffic visually
- standardLevel of quality accepted
- bannerDisplayed strip with message
- heliographSunlight-based signaling device
beacon · hand signals · flashing light · international · wigwag · heraldry · color coding · emblem · hoist · alphabet · communication · ship · yacht · rigging · flutter · mast · halyard · flapping
- port navigationharbor pilot, pilot boat, channel marker, buoy, buoys
- flagsflags, colors, bunting, banner, standard
- nauticalanchor, anchor chain, anchors, boat, boats
- nautical decorship wheel, ship model, ship models, ship bell, ship in bottle
- naval museumship, submarine, anchor, cannon, torpedo
- signalssignals, signaling, waved, nodded, gestured
signal flagradio transmission
Wireless electromagnetic signal
radio signal · wireless communication · Morse code · semaphore · flare
signal flagcoded message
Text needing decryption
hidden message · invisible ink · dead drop · secret code · cipher
sign, flag, signal, signature, signify, flagship, ensign, flagstaff