Many types of signal exists.
A flare gun is a gun designed to fire flares. A flare is defined as: A flare is a type of pyrotechnic that produces a brilliant light or intense heat without an explosion. Flares are used for signaling, illumination, or defensive countermeasures in civilian and military applications.
distress=death and childbirth
Pyrotechnic visual distress devices have an expiration date.
solar flare
Since catalysts provide an alternate pathway to lowering the energy of activation, the oxygen provides that lower energy for respiratory distress causing a rapid reaction for a normal respiratory normality
A red flare/smoke
Be in distress. The second thing you should do is to be sure nothing flammable will be set afire by them.
flares orange tarp dye flare gun parachute flare radio distress button epirb
That's the technical description for a signal flare !
They have an expiration date
hand held red flare
Waving your hands not as a fist
Send up a flare or hail local authorities on your radio.
Proper procedure for using hand held visual distress signal flare
Flare guns are used in case of emergencies in many instances. If you get lost in the woods you can shoot off a flare gun to help search groups find you.
I believe you are asking about a flare gun. It is used to put a light high up in the sky to signal distress and location.
display only when immediate or potential danger exists