Two
numeral
When a vocab word is a single kanji without okurigana (hiragana attached to the kanji) it usually has the same meaning as the kanji it's spawned from. If you know the kanji meaning you'll also know the vocab meaning. It's two!
When a vocab word is a single kanji with no okurigana, it usually uses the kun'yomi reading. Numbers are an exception to this. Numbers use the on'yomi reading, which you've already learned by learning the kanji's reading! How nice!
二ドル
two dollars
二セント
two cents
二パターン
two patterns
エントリーナンバーは二です。
The entry number is two.
二ゲームとも、アメリカにポイントが入った。
The United States got points in both games.
どうしよう。トイレットペーパーが二メートルしかないよ。
Oh, my. We only have two meters of toilet paper left.