Well the first one is "beta", the second one is "gamma" and the third one is "alpha". All of them are greek letters and are usually used to represent an unknown value in Physics.

actually these values were given to give marks for the project
do they indicate any grades or positions
umm....i'm sorry but as far as I know there is no such use of the symbols!
i think you should ask your teacher
The 1st one is beta, the coefficient of superficial expansion. 2nd one is gama, the coefficient of cubical expansion . 3rd is alpha,the coefficient of linear expansion . These are the 3 kinds of thermal expansion .