1) Astronomical observation std 2) Clock standard 3) English time initials 4) Goods and services tax 5) Prime meridian standard 6) Setting at 0 degrees long 7) Tax acronym 
Goods and Services Tax, such as levied in Canadian Provinces
See glutathione S transferase.
The GST was a Russian patrol-bomber flying-boat of the Second World War. The GST was a semi-cantilever high-wing monoplane powered by two Pratt and Whitney Twin-Wasp 14-cylinder radial air-cooled engines providing a top speed of 304 kmh and a range of 6400 km. The GST carried a crew of four and was armed with a machine-gun in a bow turret and two m...
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