二 (pinyin èr, "two") is an HSK 1 Mandarin character with 2 strokes, built on the radical 二.
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二
Newèr
two
Tone 4 · Fourth tone (falling)
Radical
二
Strokes
2
HSK
1 · tier 1a
Radical family
Other characters built on the same radical 二. Often shares meaning category.
Pinyin neighbors
Characters with the same rime -er, same-tone matches first. Many are true phonetic relatives; others are coincidental.