Nowrap/doc
Among its many uses, this template can prevent a number-unit pair from being split if it appears at the end of a line. For example, the text "900 gc" will normally split between the number and units if at the end of a line. The "900" would appear at the end of the line, and the "gc" will appear at the beginning of the line below it.
For this template's documentation, see Template:Nowrap on Wikipedia.