- ASDF is the sequence of letters that appear on the first four keys on the home row of a QWERTY or QWERTZ keyboard.
- ASDF are often used as a sample or test case or as random, meaningless nonsense.
- ETAOIN SHRDLU is the approximate order of frequency of the twelve most commonly used letters in the English language.
- The Character Generator Protocol (CHARGEN) service is an Internet protocol intended for testing, debugging, and measurement purposes.
- Written languages change more slowly than corresponding spoken languages.
- The traditional spelling of English, at least for inherited words, preserves a late Middle English phonology that is no one's speech dialect.
- The artificial preservation of this much earlier form of the language in writing might make much of what we write intelligible to Chaucer
