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| | NationMaster - Encyclopedia: Brick (Site not responding. Last check: 2007-10-24) |
 | | In number and more generally in algebra, a ratio is the linear relationship between two quantities of the same unit. |
 | | Decimal, or denary, notation is the most common way of writing the base 10 numeral system, which uses various symbols for ten distinct quantities (0, 1, 2, 3, 4, 5, 6, 7, 8 and 9, called digits) together with the decimal point and the sign symbols + (plus) and − (minus) to... |
 | | The Romans made use of fired bricks, and the Roman legions, which operated mobile kilns, introduced bricks to many parts of the empire. |
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