The term 'Apartment Sign' can be broken down into two crossword solutions: UNIT (4 letters) and TOLET (5 letters). An apartment sign is a sign that is typically placed outside of an apartment building or complex. It usually includes the name of the building, the address, and the number of units available. The UNIT solution refers to the individual apartments or units within the building, while the TOLET solution refers to the fact that these units are available for rent or lease.