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Wiktionary
unown

vb. 1 (context rare English) To cease ownership. 2 (context rare English) To disown.

Wikipedia
Unown

is a Pokémon species in Nintendo and Game Freak's Pokémon franchise. Created by Ken Sugimori, Unown first appeared in the video games Pokémon Gold and Silver and in subsequent sequels, later appearing in various merchandise, spinoff titles and animated and printed adaptations of the franchise. Unlike other characters in the franchise, Unown have no singular voice actors, but instead are voiced by several at once.

Known as the Symbol Pokémon, Unown are hieroglyph-like, thin, black symbols usually found on walls. There are 28 forms of Unown, one for each letter of the alphabet, a question mark and an exclamation point. They were featured as the main antagonists of Spell of the Unown, the third Pokémon movie. Unown have also appeared in Super Smash Bros. Melee and the Pokémon Adventures manga. Unown have received generally negative reception.