Inbox Tray on Facebook

What it signals here

reaction meaning

Relatively straightforward — used to indicate receiving messages or to prompt people to send information via Messenger.

comment use

Commenters use it to say 'send me this' on shared posts, recipes, links, or files.

boomer interpretation

Older users often interpret it literally as an inbox or email symbol and use it to reference checking messages.

group use

Group admins post it to invite members to submit content, questions, or applications to the group inbox.

See it elsewhere