(programming) A comment in source code that can be interpreted as a directive by some systems, but is ignored by those others that are not aware of the convention; formerly used to overcome compatibility issues between web browsers.

(chiefly US, law) An unnecessary, often argumentative remark made by an attorney or witness during a trial or deposition.

(law) A process of rulemaking in which a proposed rule is published in the Federal Register and is subject to comment by members of the general public.