Knowledge that allows one to get around the rules or outsmart the system. You can "beat the man" or exploit the exploiters.

An unintentional characteristic of a law which allows one to circumvent the...

An amibiguity or unintended omission in a law, rule, regulation, or contract which allows a party to circumvent the intent of the text and avoid its obligations under certain circumstances. -- used usually in a negative sense; -- distinguished from escape clause in that the latter usually is included to deliberately allow evasion of obligation under certain specified and foreseen circumstances; as, a loophole in the law big enough to drive a truck through.

a legal way of avoiding tax by exploiting part of a law.

An admissible interpretation of law or regulation which leads to a legal way of avoiding the law.

An omission or oversight error in software or hardware permitting the circumventing of the system security policy. Compare trap door or maintenance hook.

A technicality in some legislation or regulation that makes it possible to avoid certain consequences or circumvent a rule without breaking the law, such as in the use of a tax shelter.

an ambiguity (especially one in the text of a law or contract) that makes it possible to evade a difficulty or obligation

an unintentional weakness exploited by someone violating the intent of a rule

A technicality that allows a person or business to avoid the scope of a law without directly violating the law.

Unintentional oversight or obscurity in a law that makes it possible to avoid the law's purpose without actually breaking it.

A way of avoiding or getting around the law, usually associated with an omission or ambiguity in the law itself.