Post-it

A Post-it note (or sticky note) is a small piece of paper with a re-adherable strip of glue on its back, made for temporarily attaching notes to documents and other surfaces. A unique low-tack pressure-sensitive adhesive allows the notes to be easily attached, removed, and even re-posted elsewhere without leaving residue. Originally small yellow squares, Post-it notes and related products are now available in a wide range of colors, shapes, and sizes.

Though 3M's patent ran out in 1997, the term "Post-it" is not genericized. It and the original notes' distinctive yellow color remain registered company trademarks, with depictions such as "repositionable notes" used for similar offerings manufactured by competitors.