Four control knobs, as adjust audio levels on a mixing console. Generally depicted as a silver square with black knobs, turned to various levels as indicated by white pointers and scale markings.
Commonly used for various content concerning audio recording and production as well as music more generally.
Control Knobs was approved as part of Unicode 7.0 in 2014 and added to Emoji 1.0 in 2015.
U+1F39B
U+FE0F
?️ Control knobs
?️ Variation selector-16