OB会
Meanings
1
alumni association; old boys' association
Refers to a group or gathering of former members (graduates, ex-employees, etc.), often of a school or company. The term OB (old boy) is borrowed from English and commonly used in Japanese for male alumni; the female equivalent is OG (old girl).
See also: OB
Next month, the university's alumni association will hold a meeting.
He serves as the secretary of the old boys' association.