Meaning
A battery with only a thin red sliver of charge left, the same warning that appears just before a phone dies. Literally it means power is nearly gone; figuratively, that a person is drained.
It is the go-to icon for social exhaustion, long workdays or the slump after a party: “Three meetings back to back, I’m at 🪫 please no more calls.” It contrasts with 🔋 for a recharged mood and often comes with 😴.