Cap is an abbreviation for the word "captain" and is often used as a term of endearment or respect in informal settings. It can also refer to a type of headwear that covers the top of the head and has a brim, typically worn for fashion or protection from the sun. Caps can come in various styles, such as baseball caps, snapbacks, or beanies. They are popular accessories for casual and sporty outfits. Additionally, "capping" can also refer to the act of putting a limit or restriction on something.