Clessidra

A classic hourglass, all of its sand having flowed into the bottom bulb. Indicates time has passed. Color varies across platforms.

Commonly used for various content concerning time. May also be used for hourglass-shaped figures. Not to be confused with ⏳ Hourglass Not Done, whose sand is still flowing.

Used on Snapchat to indicate a Snapstreak is soon to end.