Tools of ignorance
From BR Bullpen
The tools of ignorance is a nickname for a catcher's protective equipment: catcher's mask, chest protector, and shin guards. Different sources have credited Muddy Ruel and Bill Dickey with coining the phrase. According to either version, the usage was meant to be ironic, contrasting the intelligence needed by a catcher to handle the duties of the position with the foolishness needed to play a position hazardous enough to require so much protective equipment.
 Further Reading
- Chuck Rosciam: "The Evolution of Catcher's Equipment", in The Baseball Research Journal, SABR, Volume 39, Number 1 (Summer 2010), pp. 104-112.