Doc:JA/2.6/Manual/Textures/Mapping/UV/Unwrapping - wiki https://wiki.blender.jp/Doc:JA/2.6/Manual/Textures/Mapping/UV/Unwrapping> 3次元の XYZ 座標と見分けやすいように U と V の名前で座標を呼んだのが名前の由来です。
らしいです
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