21. Together with other units of weight of the Imperial Russian weight measurement system, the USSR officially abolished the pood in 1924. 22. The currency sign for the black-letter " L " was the abbreviation for " libra ", the basic Roman unit of weight . 23. In Persia, the danake was originally a unit of weight for bulk silver, representing one-eighth of a shekel ( 1.05 gm ). 24. The Mozambican currency Metical was derived from the word " mi t ql " ( E7B'D ), an Arabic unit of weight . 25. As petcoke has a higher energy content, petcoke emits between 30 and 80 percent more CO 2 than coal per unit of weight . 26. As such, a balance must be struck, since every unit of weight not used for weaponry can be used to add additional armor tiles. 27. It was used as a unit of currency equal to four baht, and as a unit of weight is now standardised at 60 grams. 28. Another step in the evolution of money was the change from a coin being a unit of weight to being a unit of value. 29. However, from 14th to the 17th centuries the ruble was neither a coin nor a currency but rather a unit of weight and account. 30. Oh-and the kilogram is " not " a unit of weight -if one is truly metric, the Newton is the unit of weight which should be used.
