This character is a Otro símbolo and is commonly used, that is, in no specific script. El carácter es también conocido como audio control.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. U+1F39B offers a line break opportunity at its position, except in some numeric contexts.
The CLDR project calls this character “ruedas de control” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: control, diales, música, potenciómetros, ruedas.
This character is designated as an emoji. It will be rendered as monochrome character on conforming platforms. To enable colorful emoji display, you can combine it with Variation Selector-16: 🎛️ See the Emojipedia for more details on this character’s emoji properties.
El Wikipedia tiene la siguiente información acerca de este punto de código:
A control knob is a rotary device used to provide manual input adjustments to a mechanical/electrical system when grasped and turned by a human operator, so that differing extent of knob rotation corresponds to different desired input. Control knobs are a simpler type of input hardware and one of the most common components in control systems, and are found on all sorts of devices from taps and gas stoves to optical microscopes, potentiometers, radio tuners and digital cameras, as well as in aircraft cockpits.