三七二十一 Traditional form: 三七二十一 Pinyin (reading): sānqī'èrshíyī Definitions: three sevens are twenty-one (idiom) the facts of the matter the actual situation Characters: 三 - three 七 - seven 二 - two; twice 十 - ten, tenth; complete; perfect 一 - one; a, an; alone Traditional characters: 三 - three 七 - seven 二 - two; twice 十 - ten, tenth; complete; perfect 一 - one; a, an; alone