"U/V" coordinates are what the X/Y mapping coordinates are called when refering to points on a 3D model and the corresponding positions on it's 2D maps. (as in Cox's "UVMapper") And with regard to omni-gendered mapping, here is an old image for the P3 BigFace-Male model, shown wearing the same Texture Map as is applied to the woman's face in the "Cosmo/Hafeli 2.5D" post a couple threads up above.

Well, ...I thought they worked pretty kean...