UD has various meanings in the Technology category. Discover the full forms, definitions, and usage contexts of UD in Technology.
A position of the hand in which the wrist is bent toward the little finger. Ulnar deviation is a poor working position for the hand and causes nerve and tendon damage. It reduces the useful range of pronation and supination (q.v.) by approximately 50 percent, and work performed in ulnar deviation proceeds at low efficiency. Hand tool design should avoid ulnar deviation.
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