Meaning
The same looping arrows as the repeat button, with a small number 1 added in the middle. It means repeat one track only, so a single song plays again and again.
It is perfect for confessing an obsession with one song or one video clip: “That chorus is on 🔂 all day” People also use it jokingly for someone who tells the same story every time, or for the one meal they order at every visit.