In most calendar systems and languages, the days of the week, have individual names assigned to them. They can also have ordinal numbers, either starting at 0 or 1, although the first day of the week may differ by culture. Especially in computer programming, day of the week is often abbreviated to ‘DOW’. This acronym is sometimes not spelt out letter by letter, but pronounced as a whole, either as /dau/ or /dou/, like Dow Jones. Likewise it may be written in minuscules ‘dow’ like a regular lexical word. Dows further may have abbreviations or symbols.