|≈||approximately equal to|
|digits||indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …)|
A foot, metric (long) is the unit of length.
The mickey is a unit used to describe the distance of movement of a computer mouse (presumably getting its name from Mickey Mouse). There are a number of slightly different definitions for this unit.