姥姥
lǎo lao · HSK 7
mother's mother
👵 姥 = 女 woman + 老 old; doubled = mom's old-woman, your maternal grandma
Each 姥 stacks 女 (woman) beside 老 (old), literally an old woman. Reduplicating it (lǎo lao) is the colloquial northern term for your mother's mother, distinct from the father's-side 奶奶.