Any rule that prescribes or proscribes behavior in a three-second interval, especially

Any rule that prescribes or proscribes behavior during a ten-second interval, especially:

(chiefly Wikimedia jargon) It is acceptable to break rules in situations where it is beneficial not to follow them.

plural of bright-line rule

plural of five-second rule

plural of infield fly rule

plural of ten-second rule

plural of three-second rule

(law) The presumption that the failure of a party to produce a witness available to them indicates that the testimony of that witness would go against the party.

(law) The obligation of a barrister (in certain jurisdictions) to accept any work in a field in which they profess themselves competent to practise, at a court at which they normally appear, and at their usual rates.