O (kana) - Wikipedia O (hiragana: お, katakana: オ) is one of the Japanese kana, each of which represents one mora In the modern Japanese system of alphabetical order, they occupy the fifth place in the modern Gojūon (五十音) system of collating kana
JLPT N5 Grammar: お ご (o go) Polite Marker Particle Meaning . . . For some vocabulary words (like お茶 ocha), it is standard to use this prefix and it is considered rude to not use it NOTE: お (o) is mostly used with words of Japanese origin, and ご (go) is mostly used with words of Chinese origin, though there are some exceptions
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