Mu is the Greek letter used to denote the coefficient of friction, commonly (well, to math/physics/engineering students at least) found on diagrams showing blocks sliding down slopes:
Man, I feel stupid now I know it was obvious
The puns were the only way I could deal with the shear stress of studying engineering
@Stonehedge started
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Mu is the Greek letter used to denote the coefficient of friction, commonly (well, to math/physics/engineering students at least) found on diagrams showing blocks sliding down slopes: