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Reference.org
Sign-value notation
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<p>A sign-value notation represents <a href="/facts/Number/auQSAE2m">numbers</a> using a sequence of numerals which each represent a distinct quantity, regardless of their position in the sequence. Sign-value notations are typically additive, subtractive, or multiplicative depending on their conventions for grouping signs together to collectively represent numbers. </p><p>Although the <a href="/facts/Absolute_value/dwJBpEs5">absolute value</a> of each sign is independent of its position, the value of the sequence as a whole may depend on the order of the signs, as with <a href="/facts/Numeral_system/1KKlG4nd">numeral systems</a> which combine additive and subtractive notation, such as <a href="/facts/Roman_numerals/7BA8nn78">Roman numerals</a>. There is no need for zero in sign-value notation. </p>