From Memory Alpha:
An earpiece was a wireless receiver device used by communications officers, science officers and navigators during the 22nd and 23rd centuries.
By the mid-2260s, earpieces were more commonly used aboard Starfleet vessels. They consisted of several metallic rungs, attached to a virtually transparent lead that was inserted into the user's ear, negating the need for tactile support. The signals they received could be amplified throughout the user's ship, although the devices had no automatic protection that might mute or lower loud transmissions. Aboard the Constitution-class Enterprise, this style of earpiece was frequently used by Communications Officer Uhura, Science Officer Spock, and several relief navigators. (TOS: "The Corbomite Maneuver", et al.)
Edit 4-3-25: Fixed the transparent earpiece, tilted it so it looks more like the earpiece part on the Technical Manual.
Edit: 4-4-25: Rotated the round rung piece - the center ridge is supposed to be facing camera.
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