Black Medium-small Square on Facebook

What it signals here

reaction meaning

Rarely used as a standalone reaction; more commonly appears in formatted posts as a bullet point.

comment use

Older users sometimes copy-paste it as a decorative element in event announcements or group posts.

boomer interpretation

Often interpreted literally as a formatting symbol or simply ignored as decoration.

group use

Used in group post templates to separate sections of announcements, event details, or rules.

See it elsewhere