The katakana syllable コ (ko). Its equivalent in hiragana is こ (ko). It is the tenth syllable in the gojūon order; its position is カ行オ段 (ka-gyō o-dan, “row ka, section o”).

子: a boy, a girl, a child / 小: small, little

個:

The katakana syllable ラ (ra). Its equivalent in hiragana is ら (ra). It is the thirty-ninth syllable in the gojūon order; its position is ラ行ア段 (ra-gyō a-dan, “row ra, section a”).

one person

(dated) The katakana syllable ヰ (wi). Its equivalent in hiragana is ゐ (wi). It is the forty-fifth syllable in the gojūon order; its position is ワ行イ段 (wa-gyō i-dan, “row wa, section i”).

Alternative form of ゆき (yuki) / イき, イキ: (slang) orgasm; coming; cumming

Small combining form of katakana イ (i) used to explicitly specify the vowel part of the previous katakana character, or to show a speaker's pronunciation or extension of that vowel.

document / records

a line of text / (mathematics) a row of a matrix / (calligraphy) Abbreviation of 行書 (“semi-cursive script”).