File:Tangent_normal_binormal_unit_vectors.svg · Wikimedia Commons · See Wikimedia Commons
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Encyclopedic overview
In mathematics, a unit vector in a normed vector space is a vector (often a spatial vector) of length 1. A unit vector is often denoted by a lowercase letter with a circumflex, or "hat", as in
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Excerpted from Wikipedia’s “unit vector” article, available under the CC BY-SA 4.0 licence.