erg -
The unit of work or energy, being the amount of work done by a dyne working through a distance of one centimeter. Equal to 10−7 joules.
erg -
A large desert region of sand dunes with little or no vegetation, especially in the Sahara.
Wikipedia
An erg is the unit of energy and mechanical work in the centimetre-gram-second (CGS) system of units, symbol "erg". Its name is derived from the Greek ergon, meaning "work". An erg is the amount of work done by a force of one dyne exerted for a distance of one centimeter.
OmegaWiki Dictionary
Ω
erg A large, relatively flat area of desert covered with wind-swept sand and with little to no vegetation cover.