 For example, the titles of mini discs can only be entered in ASCII or half-width katakana, and half-width katakana are commonly used in computerized cash register displays, on shop receipts, and Japanese digital television and DVD subtitles.Several popular Japanese encodings such as EUC-JP, Unicode and Shift JIS have half-width katakana code as well as full-width.By contrast, ISO-2022-JP has no half-width katakana, and is mainly used over SMTP and NNTP.