[University of Illinois] A shield to prevent tripping of some {Big
Red Switch} by clumsy or ignorant hands. Originally used of the
plexiglass covers improvised for the BRS on an IBM 4341 after a
programmer's toddler daughter (named Molly) frobbed it twice in one
day. Later generalized to covers over stop/reset switches on disk
drives and networking equipment. In hardware catalogues, you'll see
the much less interesting description "guarded button".
[glossary]
[Reference(s) to this entry by made by: {Big Red Switch}{check}{scram switch}]