亥

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12th earthly branch: 9-11 p.m., 10th solar month (7th November-6th December), year of the Boar; ancient Chinese compass point: 330°

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Formation & memory

Break the character into parts you already know.

Components 亠 ? unknown part

sign of the pig · Heisig RSH #1194

top hat + elbow + 人 person — as a component also called: acorn

Keyword method from Heisig's Remembering Simplified Hanzi.

The most common words first — learning a character in context makes it stick.

Word	Pinyin	Meaning
辛亥革命	Xīn hài Gé mìng	Xinhai Revolution (1911), which ended the Qing Dynasty
俄亥俄州	É hài é zhōu	Ohio
亥时	hài shí	9-11 pm (in the system of two-hour subdivisions used in former times)
丁亥	dīng hài	twenty-fourth year D12 of the 60 year cycle, e.g. 2007 or 2067
俄亥俄	É hài é	Ohio
亥猪	hài zhū	Year 12, year of the Boar (e.g. 2007)
己亥	jǐ hài	thirty-sixth year F12 of the 60 year cycle, e.g. 1959 or 2019
乙亥	yǐ hài	twelfth year B12 of the 60 year cycle, e.g. 1995 or 2055
辛亥	xīn hài	forty-eighth year H12 of the 60 year cycle, e.g. 1971 or 2031; cf 辛亥革命[Xin1 hai4 Ge2 ming4…
癸亥	guǐ hài	sixtieth year J12 of the 60 year cycle, e.g. 1983 or 2043

These characters use 亥 as their sound component — compare how they read.

Character	Pinyin	Meaning
亥 sound part	hài	12th terrestrial branch; used in transliterations
核	hé	core, kernel; nut, seed; atom
刻	kè	to carve, to engrave; a quarter hour; a moment
孩	hái	baby, child; children
该	gāi	should, ought to, must
骇	hài	to terrify, to shock, to frighten
咳	hāi	to cough
骸	hái	skeleton, body; leg bone
颏	kē	chin
赅	gāi	to include; to prepare for
劾	hé	to look into; to impeach, to charge
氦	hài	helium
垓	gāi	border, boundary, frontier
阂	hé	separated, blocked; to prevent, to block
胲	hǎi	hydroxylamine
陔	gāi	ledge, step, terrace; slope