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 ).
These two are some of the most basic symbols of mathematics. Suppose there are two numbers a and b. If it is given that a<<b then it means that a is much lesser than b or b is much greater than a. If it is given that a>>b then it means that a is much greater than b or b is much lesser than a. This symbol is mainly used when the difference between the numbers is large. Example: 1000>>1, -2<<500