三 (Kanji for three)

Onyomi

SAN	as in, "SANTA Claus has three wives."

み*つ	(also sometimes pronounced み＊っつ) three things. Yes, it's got 2 pronunciations ★★★★☆

三人(さんにん) で	can you guess?!??? ★★★★★ 三 (three) + 人 (person) = 三人 (can you guess?!???)
三月(さんがつ)	March ★★★★★ KANA 三 (three) + 月 (moon) = 三月 (March)
三角(さんかく)	triangle ★★☆☆☆ 三 (three) + 角 (horn/corner) = 三角 (triangle)