That said, any time you are dealing with another language, it might make sense to talk to someone who can read Japanese so you don’t accidentally offend anyone. Your "random Japanese characters" may just end up being someone else’s curse word.
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There are several forms of character in Japanese, romaji – English letters like aikido then also – kanji, hiragana and katakana which are characters. Some may use more symbols than others. This is aikido in katakana ????
The 1st symbol is a, the 2nd symbol is i, 3rd is ki and last is do. Try this site if you need more info http://arakawa.edrdg.org/