Names for the number 0 in English such as 2-2, while null is used for an undefined states (for example a memory location that has not been explicitly initiated). Sporting terms (see above) are sometimes used as slang terms for zero as are "nada", "zilch" and "zip". "Zilch" is a slang term for zero, and it can also mean "nothing". The origin of the term is unknown. Names for the number 0 in English Zero is the usual name for the number 0 in English. In British English "nought" is also used. In American English "naught" is used occasionally for zero, but as with British English, "naught"
Old English phonology fronting of the open vowel to in certain cases. It also underwent vowel shifts that were not shared with Frisian: smoothing, diphthong height harmonization, and breaking. Diphthong height harmonization and breaking resulted in the unique Old English diphthongs , , , . Palatalization yielded some Modern English word-pairs in which one word has a velar and the other has a palatal or postalveolar. Some of these were inherited from Old English ("drink" and "drench", "day" and "dawn"), while others have an unpalatalized form loaned from Old Norse ( and ). Old English had four major dialect groups: Kentish, West Saxon,