Meaning of jí hé:
jí hé
集合
Verb
to gather; to assemble
Xuéshēngmen zài cāochǎng shàng jíhé.
学生们在操场上集合。
The students are gathering on the playground.
Noun
(math.) set
Shùxué lǎoshī jiěshìle liǎng gè jíhé de jiāojí hé bìngjí.
数学老师解释了两个集合的交集和并集。
The math teacher explained the intersection and union of two sets.