What does "letterman" mean?

A student who has attained a specified level of participation in a sporting or other activity, and is awarded a cloth “letter” to be affixed to an item of clothing.

What is a synonym for "letterman"?

Common synonyms include: letterwinner.

Letterman

name, noun

name, noun ·3 syllables ·Rare ·Advanced level

Definitions

Noun

1
A student who has attained a specified level of participation in a sporting or other activity, and is awarded a cloth “letter” to be affixed to an item of clothing. US
"The children seem to catch their enthusiasm from the energetic instructors, ten of them former lettermen at Kansas universities."
2
an athlete who has earned a letter in a school sport wordnet