The right logo tells both customers and potential customers a lot about the practice instantly, without much conscious thought on their part. Just as the five-year-old knows that sign means delicious food is near, you want your medical logo design to symbolize what your practice is about.
In the American English, bracket usually refers specifically to the square or box type. In British English, bracket normally refers to the round type, which is called a parenthesis mark in American usage. Parentheses are the curved brackets ( ).
The brackets, {statement}, means the set of all objects which satisfy that statement. The [math]\in[/math] symbol stands for in or is a member of The [math]R[/math] stands for real numbers, and [math]R^2[/math] stands for the real plane. The pipe symbol, |, adds another condition. Think of it as saying and or such that.