IJK

IJK or ijk may refer to:

IJK Software Ltd for Tangerine Computer Systems
IJK - Imad Jack Karam - An indie singer/songwriter
International Youth Congress of Esperanto
Izhevsk Airport - IATA code
Y-Chromosomal Haplogroup "IJK"
Unit vectors in the Cartesian coordinates are denoted by $\mathbf{\hat{\boldsymbol{\imath}}}$ , $\mathbf{\hat{\boldsymbol{\jmath}}}$ and $\mathbf{\hat{\boldsymbol{k}}}$ where $\mathbf{\hat{\boldsymbol{\imath}}} = \begin{bmatrix}1\\0\\0\end{bmatrix}, \,\, \mathbf{\hat{\boldsymbol{\jmath}}} = \begin{bmatrix}0\\1\\0\end{bmatrix}, \,\, \mathbf{\hat{\boldsymbol{k}}} = \begin{bmatrix}0\\0\\1\end{bmatrix}$
Unit quaternions, similarly, are typically represented by i, j, and k.

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