Ononot — If \|\mathbf{a} \times \mathbf{b}\| = 0 for non-zero vectors

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Vectors & Spaceseasy

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If $\|\mathbf{a} \times \mathbf{b}\| = 0$ for non-zero vectors $\mathbf{a}$ and $\mathbf{b}$ , what does this mean geometrically?