noun
interjectory particle
A grammatical term for particles like よ, ね, and さ that express the speaker's attitude or call for the listener's attention.
「ね」や「よ」は間投助詞の一種です。
"Ne" and "yo" are types of interjectory particles.
Compound of 間投 (interjection) + 助詞 (particle). The term is a linguistic coinage; the exact historical derivation is uncertain.