back of neck / item / thing / term (in a mathematical formula) / sum (of money) / classifier for principles, items, clauses, tasks, research projects etc
项
=
工
+
页
:
Mnemonic symbol: a necklace (项). Marie Curie (xi) lost her necklace in the anglepod's bathroom (ang4) and tries to get it out of the toilet again. Marie jotted down some calculations (项) on a sheet of paper (页) and uses a steel beam (工) as a lever to get his necklace out by putting the lever at the exact right position and the sheet of paper on top of the other side of the lever.