Mathematics and logic The colon is used in mathematics , cartography , model building and other fields to denote a ratio or a scale , as in NUMBER@1 -LRB- pronounced `` three to one '' -RRB- .

Mathematics The colon is also used in mathematics , cartography , model building and other fields to denote a ratio or a scale , as in NUMBER@1 -LRB- pronounced `` three to one '' -RRB- .
