- friend system usage
- Sent to signal 'look back at what I sent earlier' or to revive an old conversation thread.
- streak use
- Rarely streak-related; occasionally used humorously in snap streaks referencing 'going back to the start' of a friendship.
- story meaning
- Used in story replies to indicate the sender is referencing a previous snap in someone's story sequence.
- snap context
- Sometimes used when replaying a snap, captioning the replay with ◀️ to show they went back for a second look.