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Alstrinian flag by yourfavoriteboywife
Alstrium is a xenogender in which one feels disconnected from all aspects of from the gender binary, but possess an essence of androgyny that manifests in a celestial, ethereal, or otherworldly way. [1]
The name alstrium is derived from the Latin root word aster, meaning "star," and inspired by the English word astral which means "of, relating to, or coming from the stars." [2]
History[]

Alternative flag with symbol
Alstrium was coined by user Calliope as a combination of two genders they had already coined, aetherium and luminium.