幾～
いく～ · iku～ · JLPT N2 · noun
several ~
幾 iku = how many: the same root as いくつ (how many) and いくら (how much)
As a prefix, 幾 turns a counter into an uncertain amount: 幾日 (ikunichi) means several days and 幾人 (ikunin) means several people. The kanji is built from two 幺 tiny-thread parts, an old sign for small amounts that are hard to count.