- Aka, ローマ字, roumaji, rômaji, rōmaji and misspelled romanji, is what the latin alphabet is called when used to write Japanese. Just as the above spellings of imply, there are multiple romanization methods that can lead to confusion. In general, it is always worth spending a week or so learning the kana system and avoiding romaji as much as possible.
Romaji is also used in entering Japanese text with computers. See IME for more details.