口 — the “mouth” radical

Radical #30 3 strokes

a very common radical — speaking, eating, openings 66 of the JLPT kanji on this site are built with it — recognizing the piece makes them far easier to remember.

Kanji using the 口 radical (66)

同same, agree 合fit, suit 員employee, member 問question, ask 和harmony, Japanese style 名name, noted 向yonder, facing 告revelation, tell 品goods, refinement 各each, every 台pedestal, a stand 口mouth 営camp, perform 商make a deal, selling 味flavor, taste 命fate, command 含contain, include 呼call, call out to 古old 史history, chronicle 器utensil, vessel 否negate, no 周circumference, circuit 号nickname, number 右right 吉good luck, joy 司director, official 善virtuous, good 喜rejoice, take pleasure in 喪miss, mourning 君mister, you 吸suck, imbibe 哲philosophy, clear 喚yell, cry 唱chant, recite 吹blow, breathe 句phrase, clause 噴erupt, spout 唆tempt, seduce 唯solely, only 喫consume, eat 啓disclose, open 叫shout, exclaim 咲blossom, bloom 召seduce, call 嘉applaud, praise 呈display, offer 后empress, queen 嘆sigh, lament 吐spit, vomit 哀pathetic, grief 呉give, do something for 喝hoarse, scold 嘱entrust, request 吟versify, singing 喬high, boasting 唇lips 唄song, ballad 呂spine, backbone 嚇menacing, dignity 只only, free 嗣heir, succeed 叶grant, answer 啄peck, pick up 吏officer, an official 哉how, what

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Radicals (部首, bushu) are the shared building blocks of kanji, used to sort them in every dictionary. Learn the common ones and new kanji stop looking random.