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<p>of a vector space, and every vector in the space may be written as a <a href="page.php?w=linear_combination">linear combination</a> form of unit vectors.</p>

<p><big>Orthogonal coordinates</big></p>
<p><big>Cartesian coordinates</big></p>
<p>Unit vectors may be used to represent the axes of a <a href="page.php?w=Cartesian_coordinate_system">Cartesian coordinate system</a>. For instance, the standard unit vectors in the direction of the x, y, and z axes of a <a href="page.php?w=Cartesian_coordinate_system">three dimensional Cartesian coordinate system</a> are</p>

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