Term

Graphical Symbol

in full

simplified

Devices

telephone receiver

or

microphone

or

throat microphone

hand set

loudspeaker

or

monohead, general

stereohead, general

record head, mechanical

replay head, mechanical

magnetic head, general

recording head

playback head

magnetic head for recording and playback

erasing head

bell, general

alternating current bell

direct current bell

single-stroke bell

buzzer

horn

siren

howler

Signs

electromagnetic

electrodynamic by coil

electrodynamic by band

piezoelectric

magnetostrictive

capacitive

carbon

Examples

electromagnetic telephone receiver

carbon microphone

capacitor microphone

magnetostrictive loudspeaker