In this instance, the "x" means "times" or "multiplied by". When dimensional indicators (numbers) are inserted for "width" and "height", a perimeter value may be easily calculated. Mathematically speaking, it is merely a notational device. Any character "could be used", but standardization throughout a method of communication is desirable for all.
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Volume.
Double [ (length x width) + (length x height) + (width x height) ]
length x width x height
Volume = Length x Width x Height. If the prism is square, then either Height = Width or Height = Length In the first case, Volume = Length x Width2 and so Width = sqrt(Volume/Length) and Height = Width. In the second case, Volume = Length2 x Width and so Width = Volume/Length2 and Height = Length.
They are generally ordered by Length x Width x Height.