'autosyn' originates from English, combining Greek roots 'autos' and 'syn', where 'autos' meant 'self' and 'syn' meant 'together' (from 'synchronous'/'synchronize').

'autosyn' began as a technical/trade name in the mid-20th century for a specific type of synchro (synchronizing transmitter/receiver) and was later adopted more generally to refer to similar position-transmitting devices.

Initially, it meant a specific trademarked device; over time it evolved into its current, broader meaning of 'an electrical device for transmitting angular position' (often used generically).