Abbreviation: A/M = "A/M mode" (Nikon)

The abbreviation A/M means "A/M mode" and is seen on Nikon products.

Explanation from Nikon

A/M mode (autofocus with manual override, AF priority mode)
An “autofocus-priority autofocus” mode that reduces the sensitivity of the manual override to prevent unexpected switching from auto to manual.

See examples of effected products