noun
Refers to two persons. Can imply a pair or couple depending on context. The reading ににん is less common and mainly used in formal counting or legal contexts.
二人で映画を見に行った。
The two of us went to see a movie.
あの二人はとても仲
Those two get along very well.
二人用のテーブルを予約した。
I reserved a table for two.