A model or type of machinery or device which precedes the current (or later) one. Usually used to describe an earlier, outdated model.
One who precedes; one who has preceded another in any state, position, office, etc.; one whom another follows or comes after, in any office or position.
A vertex having a directed path to another vertex
Used to warn of danger in signs and notices.
Something spoken or written that is intended to warn.
The action of the verb warn; an instance of warning someone.