A shroud or cover on an important button/switch/slider so as to avoid an accidental trigger.
From Big red button - Wikipedia, the free encyclopedia :
Varous styles, depending on type of switch:
From Big red button - Wikipedia, the free encyclopedia :
A Big Red Switch often includes a molly-guard, a cover that must be lifted to trip the switch. The original molly-guard was jury-rigged from Plexiglas to prevent a programmer's young daughter Molly from pressing the BRS on an IBM 4341 server, after she had done so twice in one day.
Varous styles, depending on type of switch: