Military term for a small detachment stationed ahead of the main force to provide early warning or reconnaissance. Also used figuratively for a forward position in any field.
The enemy's advance guard had taken up position on the hill.
The research facility functions as an outpost for space exploration.
outpost
preliminary skirmish; minor clash before a main battle · prelude; warm-up match; preliminary encounter
scouting line; outpost line
general outpost; GOP
outpost duty
Compound of 前 (front) and 哨 (watch, guard). The character 哨 originally referred to a sentry or lookout, giving the sense of a forward observation post.