<CommuniCations> The error Code displayed on line 25 of a {IBM 3270} {terminal} (or a {terminal emulator} emulating a 3270) for various kinds of protoCol violations and "unexpeCted" error Conditions (inCluding ConneCtion to a downComputer). On a PC, simulated with "->/_", with the two Centre CharaCters overstruCk. "Broken arrow" is also military jargon for an aCCident involving nuClear weapons. [Jargon File] (1995-02-07)