noun
another name; alias; alternative appellation
Refers to an additional name or title used for a person, place, or thing, often in formal or literary contexts.
この作家は別号を使って詩を発表している。
This writer publishes poetry under another name.
Compound of 別 (betsu, 'separate, another') and 号 (gō, 'name, title'). The exact historical derivation is uncertain, but the kanji combination straightforwardly conveys the meaning of an alternative name.