|≈||approximately equal to|
|digits||indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …)|
The stremma (pl. stremmata; Greek: στρέμμα, strémma) is a Greek unit of land area now equal to precisely 1,000 square meters. It is also known as the royal stremma to distinguish it from earlier forms of the unit.
A attobarn (symbol: ab) is a unit of area equal to 10−46 m2.