X Marks the Spot

When using the word X-ray, the letter X is capitalized and the word is hyphenated.

The same is true when you are describing a graph’s X-axis.

(And, as a corollary, Y-axis follows the same pattern).

When you are writing about magnification, the letter X is used with no space between the number and the X. Example: “This newfangled camera has a 500X zoom lens.”

However, the letter X is not used in either upper or lower case as a multiplication symbol when describing dimensions. Rather, insert a multiplication symbol [at the top menu, click Insert, then Symbol] and don’t use any spaces on either side of it.

Example: “You just can’t fit a king-sized bed in a 10×10 ft bedroom!”


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