Úlfhéðinn : O.N. ~ a unique type of warrior who oft fights alone and often at night specializing in long-range operations far behind enemy lines. Their symbol is that of Wolf, and some sources claim them to be especially dedicated to Oðhinn.
Unconsious : A.E. ~ the part of one's mentality which is often a powerful force, but is seldom perceived. When something is unknowingly done through one's instinct so that one is not actually aware of doing said thing is an example of this.
Ut : O.N. ~ the word for out, which can also mean 'outside of' something. As is the case of Utgard, the Giants' stronghold, which is outside MidgardR, in Jotunheim.