This is an emoji you'd see on equipment used for music mixing or by DJs. It's also used playfully in a metaphorical sense to mean adjusting the level of emotions or states, like 'Let's raise our energy level! 🎚️' or 'I want to lower my stress level.'

This emoji is often used with 🎛️ (control knobs) to represent professional audio equipment. Beyond just volume control, it's also useful for adjusting difficulty in game settings or describing an app's user settings screen. Using it like, 'I've perfected the settings for the best possible sound 🎧🎚️' can give off a professional vibe.