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Ｉ＇ｍ ａｗａｒｅ ｏｆ ｔｈｅｍ． I don't have any particular use for them, though. Do you use them?

• qiqitori 5y ago
  They are extensively used in Japanese computing. E.g., when you start typing numbers without first switching off the input method editor (which allows you to select Japanese/Chinese characters), by default (*possibly depends on platform), you will get full-width numbers as the first conversion candidate. On Japanese sites, HTML forms also often expect either full-width or half-width letters and numbers (in, e.g., addresses). For this reason, it might be useful to generally be aware of them even if you don't use CJK.