Half of a full unit. For instance, a half-dollar.
Half Eagles were $5 face value U.S. gold coins, issued from 1795-1929. Each contains .24187 oz. actual gold weight.
A stamp on the surface of a precious metals bar (gold, silver, platinum, etc.) that indicates the brand, serial number, weight and/or purity of metal content.
A purchase of sale of a futures contract option which is designed to lessen the harm of adverse movement in the value of the asset.
A significant accumulation of items over a number of years.