|≈||approximately equal to|
|digits||indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …)|
A circular thou is a unit of area, equal to the area of a circle with a diameter of one thou.
Square micrometre or Square micrometer is a SI prefixes applied unit of area, symbol µm2, is a multiple of the of SI prefixes (micro) used with the metre.