Where are you getting these symbols from, that they aren't explaining what they mean. The "^" is usually called a "hat" and refers to a proportion (as opposed to a population). Not sure what your clockwise-symbol is. Some context would help.
thanks for your reply
can you tell me please what does the ^ over β symbol represents here:
Linear regression - Wikipedia, the free encyclopedia
and here:
Regression analysis - Wikipedia, the free encyclopedia
thanks