OK, WikiIsNotaDictionary, but there seem to be a few math definitions around.

The '''Cross''''''Product''' of two vectors is a vector perpendicular to both which has a length equal to the area of the parallelogram defined by them, and points in a direction such that it obeys the right-hand rule. That makes the '''Cross''''''Product''' anti-commutative.
	* ''a'' '''x''' ''b'' = -''b'' '''x''' ''a''
	* ''(ka)'' '''x''' ''b'' = k(''a'' '''x''' ''b'')
	* ''a'' '''x''' ''a'' = 0

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	What do you get if you cross a sheep with a kangaroo?:	A woolly jumper
	What do you get if you cross a mountaineer with a mosquito?:	Nothing - you can't cross a scalar and a vector.

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CategoryMath