All fire extinguisher nameplates have either the letter or picture symbols shown below. Anyone who might be expected to use a fire extinguisher should be familiar with the letter or picture symbols identifying the type/s of fire on which it may be used (see Types of Fires).
The newer picture symbols use the International sign system diagonal
red slash to indicate a potential hazard if the extinguisher
is used on that particuliar type of fire (see Types
of Extinguishers).
Absence of a type symbol means only that the unit is not recommended as particularly effective for that class, but not dangerous if used in error.
