Closed Mailbox With Raised Flag on LinkedIn

What it signals here

professional use

Used to indicate 'I've sent you a connection request or InMail — please check your inbox.'

post context

Appears in posts about outreach, networking, or sending proposals — 'the flag is up, ball's in your court.'

appropriateness

Moderately appropriate; professional enough to use without raising eyebrows.

comment use

Left in comments to nudge someone to check their messages in a polite, non-pushy way.

See it elsewhere