The first sign of syphilis is a small sore, called a chancre (SHANG-kur). The sore appears at the spot where the bacteria entered your body. While most people infected with syphilis develop only one chancre, some people develop several of them. The chancre usually develops about three weeks after exposure.
The colon is the symbol :. It is used in a number of different ways in mathematics. 1. To denote ratio or odds, as in 2:1 (voiced two to one). 2. To mean such that in constructions such as (voiced the set of numbers such that ). 3. To give a name to a map, e.g., (which is equivalent to the function notation ).
This list is incomplete; you can help by expanding it. This is a list of symbols found within all branches of mathematics to express a formula or to represent a constant. When reading the list, it is important to recognize that a mathematical concept is independent of the symbol chosen to represent it. Symbols that point left or right: 2  Brackets: Symbols that are placed on either side of a variable or expression, such as | x 3  |. Other non-letter symbols: Symbols that do not fall in any of the other categories.