Mr. Micawaber:
This four-letter noun, on what level is it uncountable — like water, like sand or like fish?
Is it artificial? Does it exist on its own, apart from compound nouns?
«Two hyphens at either end of a parenthetical remark strike out the words between»
To type a em-dash in Windows, turn numlock on, hold ALT and type 0151 on the numeric keypad ;)