Sheetlet – this is a format that is now issued regularly by postal administrations . Instead of issuing stamps in large sheets of 40, 100 or even 200 stamps, smaller sheetlets with 16 or 20 stamps are issued with a large selvage area which may incorporate part of the stamp design or theme.
Souvenir Sheets – the many postal services sometimes release stamps in a format that look like a sheet with a big picture. Various parts of the picture can be torn out and used as postage stamps. Souvenir sheets should be distinguished from souvenir cards, which are souvenirs of a philatelic meeting or exhibition but are not valid for postage.