It is a dummy light. The above answers are literally common sense generic answers… “The brake light means the parking brake is applied" … of course it does.
Most likely your alternator is about to go out… Late 90's civics would have a dummy warning where the tachometer would hold at redline for several seconds at a time(while driving normal of course) as a warning of eminent alternator failure… what you need is to find a Honda Master Tech….