The alarm is active when the lighted key emblem is flashing
Key flashing = alarm on or service mode is set. Key steady = alarm off.
A failure in the theft alarm or sentry key system (chip key).
If it is a public sign, perhap it means lock your car.
It is likely that your battery is dead.
If by sign you mean key signature than it would be 2 sharps: F# and C#. DEF#GABC#D
A flashing air bag light on the 1992 Ford Crown Victoria means that the airbag system has been disabled. This could be because it is damaged or because the key for the system is turned to "off."
Once you get the key with the correct chip in it for your car, just turn the ignition on and leave it on until the security light quits flashing, it will take several minutes, then turn the key off and start car
that's a sure sign of a dead battery.
Symbols are small, well, symbols that are ON the map. The Key is off to the side, and tells you what the symbols mean.
It means the note should be played as written disregarding the key sign. Also, by convention, sharps and flats are "sticky" within a measure; the natural sign resets those as well.
Hold down the shift key and press the 3 key It will make a # sign.