alumna; former female student; old girl
Used for female graduates of a school, university, or organization; the female counterpart of OB (old boy). Common in alumni contexts.
See also: OB
彼女はこの大学のOGです。
She is an alumna of this university.
OG会に参加する予定です。
I plan to attend the alumnae reunion.
office girl; female office worker
Refers to a young female employee doing clerical or assistant work; somewhat dated, often associated with the Showa era. Modern usage is less common.
昭和の時代、多くの女性がOGとして働いていた。
In the Showa era, many women worked as office girls.
More formal than 人 — used for headcounts in reservations, staff lists, and announcements (5名様).
Standard abbreviation written in Latin letters; widely used in Japanese contexts for alumnae and office girls.
Search-only kana form; not a practical written spelling.
Abbreviation from English 'old girl' and 'office girl', borrowed into Japanese as wasei-eigo. The exact historical path is uncertain.