The possibilities get richer if you consider mere expressions and puns on them.
$$==0 for 'swapper' (a little old-fashoned, that)
$?!=0 for 'baby on board'
Regex matches can make an assertion...
/VIP/
...or even tell a sad story.
/DWI/
$&=1/4
/APB/
$!!=0
/DOA/
After Compline, Zaxo
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