Common loanword for a mechanical or structural arm, such as a robot arm, crane arm, or the arm of a chair. Not used for the human body part, which is 腕.
This crane's arm can extend up to 10 meters.
The robot arm grabs the part.
The arms of this chair are adjustable.
automated retroactive minimal moderation; ARMM
Rare technical abbreviation used in online moderation contexts. Not a general-use term.
ARMM is a technical term used in some online communities.
The worker operated the robot's arm.
When you press the switch, the arm moves slowly.
armrest
arm cover; armrest cover
armchair
armband
armhole; sleeve-hole
Borrowed from English 'arm'.