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...dangerous water conditions (double red flags indicate beach closure). Red flags of various designs indicate dangerous wind and wave conditions for mariners ...nce to the case. For example, email [[spam filter]]s make use of such "red flags". ...

...t'' (C35)]] using [[International maritime signal flags]] as a recognition signal]] ...ver]] [[wikt:operation|operation]]s. It can also be used in [[biology]] to signal that a [[molecule]] or [[chemical]] is to be [[wikt:bound|bound]] to anothe ...

[[Image:ICS Sierra.svg|thumb|The Sierra [[International maritime signal flags|signal flag]] used to convey, "I am operating astern propulsion."]] ...dible blasts or by flying the Sierra [[International maritime signal flags|signal flag]] (white border with one central blue square). ...

...051129-N-0685C-007 Quartermaster Seaman Ryan Ruona signals with semaphore flags during a replenishment at sea.jpg|right |thumb|upright=1.3|A [[US Navy]] cr ...for emergency communication in daylight or using lighted wands instead of flags, at night.{{Citation needed|date=June 2017}} ...

...ected networks]], or for traffic signalling such as in [[Railway semaphore signal|railway systems]], or [[traffic light]]s in cities.<ref>{{Cite web|title=Se ...phore for long-distance communication. The smoke is used to transmit news, signal danger or gather people to a common area. ...

...sions (''social means of communication''); [[International maritime signal flags|flag signs]]; ...

...ed [[fish hook|hook]] suspended underneath, and as a [[bite indicator]] to signal the angler any changes in the hook's underwater status. ** Lifebuoys with flags, used on [[yacht]]s and smaller pleasure craft ...

...ore]] is a method of telegraphy, whereas [[pigeon post]] is not. Ancient [[signal]]ling systems, although sometimes quite extensive and sophisticated as in C ....</ref> The Chinese signalling system extended well beyond the Great Wall. Signal towers away from the wall were used to give early warning of an attack. Oth ...

{{Redirect|Semaphore telegraph|signalling by hand-held flags|Flag semaphore|other uses|Semaphore (disambiguation)}} ...e of the semaphore system is [[flag semaphore]], signalling with hand-held flags. ...

...federal grants. They routinely monitor such research publications for red flags and their investigation is subject to a statute of limitations. Other priva ** changing brightness and contrast to leave only the most intense signal ...

...or instance, many flowers use symmetrical shapes and distinctive colors to signal to insects where [[nectar]] is located. Humans engage in interspecies commu ...communication, which focuses on how a message is first translated into a [[signal]] and then back into a message]] ...

...7px]]The Sign Union flag was designed by [[Arnaud Balard]]. After studying flags around the world and [[vexillology]] principles for two years, Balard revea * [[Gang signal]] ...