|≈||approximately equal to|
|digits||indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …)|
Square megametre (International spelling as used by the International Bureau of Weights and Measures) or Square megameter (American spelling) , symbol Mm2, is the SI prefixes used with the metre of area or surface area.
Board is a unit of area.