broken arrow

Free On-line Dictionary of Computing

<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 down computer). 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)

The Jargon File

[IBM] The error code displayed on line 25 of a 3270 terminal (or a PC emulating a 3270) for various kinds of protocol violations and “unexpected” error conditions (including connection to a down computer). On a PC, simulated with ‘->/_’, with the two center characters overstruck.

Note: to appreciate this term fully, it helps to know that “broken arrow” is also military jargon for an accident involving nuclear weapons....