喜び
よろこび · yorokobi · JLPT N3 · noun
joy
🎉 yorokobi ≈ Yo, rock 'n' be happy! The noun form of 喜ぶ, to rejoice
喜び is the noun form of the verb 喜ぶ (yorokobu, to be glad): the verb's -u ending becomes -i, and the action turns into a thing. The kanji 喜 has 口 (mouth) at the bottom, the mouth that laughs or sings when you are happy.
喜 — drum 壴 (top) + mouth 口 (bottom)
Originally a pictograph showing a drum (壴) above a mouth (口), depicting people singing or shouting joyfully alongside drumming at a celebration. The combination conveyed festive happiness, and the character came to mean 'joy' or 'to like.' The drum element 壴 itself depicts a drum on a stand.