Over time, this term has been applied to many different types of graffiti. Subway art says it is "a name painted quickly with one layer of spray paint and an outline", although some consider a throwup to be bubble letters of any sort, not necessarily filled. Throwups can be from one or two letters to a whole word or a whole roll call of names. Often times throwups incorporate an exclamation mark after the word or letter. Throwups are generally only one or two colors, no more. Throwups are either quickly done bubble letters or very simple pieces using only two colors.