It means hectoLiters. It has an exponential size of 10^2.
i would imagine it stands for high lob wedge since the degree is > 60 degrees.
MG stands for milligrams in measurement.
tsp in measurement stands for teaspoon.
hl means hectoliter, which means one hundred liters
hectare
I believe it stands for Horace Lawson Hunley, who was the developer of the submarine.
hectare
Length
decimeter
Unit of Measurement
hg is a measurement of Vacuum measured in Inches of Murcury.
metres (or miles)