Stamp sheets are a type of paper that have been pre-printed with a design or pattern. They are often used for collecting stamps, as the design makes it easier to organize and display them. The term 'stamp sheets' can also refer to a sheet of stamps, which is a sheet of paper with multiple stamps printed on it. The crossword solution for the term 'stamp sheets' is 'panes', which refers to the individual sections of a sheet of stamps.