Final answer:
The Greek letters on the badge of the brothers are Alpha, Epsilon, Delta, and Gamma.
Step-by-step explanation:
The Greek letters on the badge of the brothers are Alpha, Epsilon, Delta, and Gamma. These letters are part of the Greek alphabet, which is a set of letters used in the Greek language.
For example, Alpha is the first letter of the Greek alphabet, and it is represented by the symbol A. Epsilon is the fifth letter and is represented by the symbol E. Delta is the fourth letter and is represented by the symbol D. Gamma is the third letter and is represented by the symbol Γ.
These Greek letters are commonly used in various contexts, including fraternities and sororities, as well as mathematical and scientific notations.