medium sideburns

Sideburns that go pass the mid section of the ear, but do not reach the jaw bone like long sideburns.

Examples:-
Meaning

The sideburns are typically used as a masculine trait for younger characters, characters that can't grow facial hair, or just as a design choice.

Artists that are used to drawing masculine characters or bara style tend to emphasize the sideburns' length and width
Danbooru post #6871147, Danbooru post #5843642

Even with more simplified designs like chibi, faceless male etc
Danbooru post #7068670, Danbooru post #6339493

While artists that draw more bishounen-esque characters usually pay them less attention and might draw them thinner, shortener or inconsistently
Danbooru post #4914584, Danbooru post #3803782