登记表(dēng jì biǎo) - registration form in Mandarin

登记表 (dēngjìbiǎo) is a registration form, the piece of paper (or screen) you fill in to formally record your details somewhere. It combines 登记 (dēngjì), "to register, to check in", with 表 (biǎo), "form, table", the same 表 (biǎo) that shows up in 时间表 (shíjiānbiǎo), "timetable".

You meet this word wherever there is officialdom: checking into a hotel, enrolling at school, registering at a clinic, or going through immigration all involve 填写登记表 (tiánxiě dēngjìbiǎo), "filling in a registration form". 填写 (tiánxiě) is the verb pair to know alongside it, "to fill in".

Note that 登记 (dēngjì) alone is already a full verb meaning "to register" or "to check in" (as at a hotel desk), so 登记表 (dēngjìbiǎo) is literally "the form you use when you 登记 (dēngjì)". Keeping that link in mind makes the compound easy to reconstruct from memory.