Filler text is type of sample text displayed to test the fonts and layout of a project. It is also sometimes used to spoof email spam filters. The characters in filler text are arranged such that they do not form coherent words in the readers' language — as in case of lorem ipsum, a commonly used filler text scheme derived from Latin. The letters A, D, E, H, I, L, N, O, R, S, T and U are the 12 most commonly used characters in the English language, and are therefore the most commonly used and generated characters by random text generators. The process of using filler text is known as greeking.