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If it's feasible to add with no big effort, an acronym tag would be useful. I've seen it on an SMF forum (which has been transferred from a native script, which also included that tag). It would save from bracketed explanations disrupting the flow especially at the Monastry.

The SMF one works like this:

Code:
[acronym=long expression]short expression[/acronym]
The short expression prints underlined with dashes. The long expression appears on hover.

There's also an abbreviation tag with identical syntax function:

Code:
[abbr=long expression]short expression[/abbr]
The former native script would handle it this way:

Code:
!acronym(short expression=long expression)
.