The katakana syllable ニ (ni). Its equivalent in hiragana is に (ni). It is the twenty-second syllable in the gojūon order; its position is ナ行イ段 (na-gyō i-dan, “row na, section i”).

(nonstandard, linguistics) The hiragana syllable き゚ (ngi). Its equivalent in katakana is キ゚ (ngi).

the Baijiaxing (Hundred Family Surnames), a classic Chinese text composed of surnames

infiltration