An invoice consists of a header (customer, addres, date) and details (a list of purchased products). I am looking for a single English word meaning a single element from the list of purchased products on an invoice. "invoice_line" or "invoice_position" are not good because they are two words. "line", "position" or "element" are very general and can mean anything, not related to invoice. I'd like a person who sees this single word to have an idea what it means without also seeing the word "invoice".