mil
The weird thing is, to a machinist, 0.001 of an inch is a 'thou', and 0.00001 is a 'mil', and it took me years to commit that to memory.
Edited for typo, sorry.
0.0001 is a 'tenth'
@Felthry I voted million before realizing no wait I absolutely do hear that for millilitre. A hundred mil. Fifty mil. Although I never interpreted it as a direct shortening of millilitre so much as "pronouncing mL out loud". (On the other hand, I have never in my life heard anyone call millimetres anything but millimetres.)
@Felthry oh, not "mil-" but "a mil"...