The non-breaking space looks like a normal space, but prevents an automatic line-break from occurring between the two text items it connects.

Wikipedia link: Non-breaking space

I use it when I want words not to get separated from their inline bullet-type markers [(i), a), – etc.]  This is useful in grant application documents where you might want to use lists but space is at a premium.

To type a non-breaking space:
Windows:   Alt+255
Mac:          Option+Space