To notify eveyone on an airbase of a covert chemical and biological attack
Smoke signals were used to communicate with other people from far away when they were in trouble and needed help. Old Indian tribes would have special signals to communicate to there own tribe that was far away. Because anyone could see the smoke signals, the sender and the receiver of the smoke signals had their own special code.
Signals
If the meaning is "prior warning" (ie: "warning in advance") then "advance warning" is correct. If the meaning is "further warning" (more urgent than when previously given) then "advanced warning" is correct.
If you mean musical instruments, the Roman army used their horns (lituus, cornu and buccina) to send out signals. If you mean fighting instruments such as javelins, swords, catapults, etc. they were used in battles and sieges.If you mean musical instruments, the Roman army used their horns (lituus, cornu and buccina) to send out signals. If you mean fighting instruments such as javelins, swords, catapults, etc. they were used in battles and sieges.If you mean musical instruments, the Roman army used their horns (lituus, cornu and buccina) to send out signals. If you mean fighting instruments such as javelins, swords, catapults, etc. they were used in battles and sieges.If you mean musical instruments, the Roman army used their horns (lituus, cornu and buccina) to send out signals. If you mean fighting instruments such as javelins, swords, catapults, etc. they were used in battles and sieges.If you mean musical instruments, the Roman army used their horns (lituus, cornu and buccina) to send out signals. If you mean fighting instruments such as javelins, swords, catapults, etc. they were used in battles and sieges.If you mean musical instruments, the Roman army used their horns (lituus, cornu and buccina) to send out signals. If you mean fighting instruments such as javelins, swords, catapults, etc. they were used in battles and sieges.If you mean musical instruments, the Roman army used their horns (lituus, cornu and buccina) to send out signals. If you mean fighting instruments such as javelins, swords, catapults, etc. they were used in battles and sieges.If you mean musical instruments, the Roman army used their horns (lituus, cornu and buccina) to send out signals. If you mean fighting instruments such as javelins, swords, catapults, etc. they were used in battles and sieges.If you mean musical instruments, the Roman army used their horns (lituus, cornu and buccina) to send out signals. If you mean fighting instruments such as javelins, swords, catapults, etc. they were used in battles and sieges.
Harriet Tubman used various signals to communicate with enslaved people during their escape on the Underground Railroad. She employed coded songs and spirituals, which contained hidden messages about safe routes and timing. Additionally, she used natural signals, such as specific stars or landmarks, to guide fugitives at night. Tubman’s keen awareness of her surroundings allowed her to navigate and ensure the safety of those she led to freedom.
neon is used for warning signals
standardized warning signals for CBRNE medium and high threat areas
standardized warning signals for CBRNE medium and high threat areas
there is lots of signals to many to tell
A deer uses his tail to send signals to the others in his herd. It is often used as a warning for danger.
Diaster warning, attack warning, and all clear.
disaster warning, attack warning, and all clearstandardized warning signals and actions for CONUS and U.S. Territoriesdisaster warning, attack warning, and all cleardisaster warning, attack warning, and all cleardisaster warning, attack warning, and all cleardisaster warning, attack warning, and all cleardisaster warning, attack warning, and all cleardisaster warning, attack warning, and all cleardisaster warning, attack warning, and all clear
standardized warning signals and actions for CONUS and U.S. territories
There are several way of getting across a warning signal. For example, hand signals, alarms, and code phrases are good means of low-key communication.
Some people who get migraine headaches have warning signals before the headaches begin, such as restlessness, tingling in an arm or leg, or seeing patterns of flashing lights.
sirens, base-wide announcements, colored flags, and hand signals
they are prepared by the warning signals that they get.