The numbering system used by the Rothi has as its basis the number four. For the Rothi, the significance of the number four comes understandably from the fact they have four fingers on each hand. The Rothi numeral system has similarities to the system developed by the ancient Roman Empire on Earth. First, neither system has a symbol for zero. Secondly, both systems are additive. For example, the Rothi symbol for the number ten is a combination of the symbols for the number two and the number eight (2 + 8 = 10). The symbol for the number sixteen might be seen either as a combination of the symbols for twelve and four or a combination of two fours and an eight. The spacesuit and spacecraft of Spacemouse 9 are imprinted with a circle and slash, which to the Rothi, represent the number nine.
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