The part alternation mark emoji represents a musical notation symbol.
Unicode: U+303D U+FE0F
The part alternation mark (〽️) is a musical notation symbol used to indicate a change in the melodic line or part. It is commonly used in sheet music to denote when a different instrument or voice should take over the melody. While primarily musical in nature, it can also represent alternation or switching between different elements.
The pianist followed the part alternation mark 〽️ to switch to the lower melody line.
After the 〽️ symbol, the chorus took over the lead vocals from the soloist.