Final answer:
The symbol for Sigma Gamma Rho Sorority, Inc. is not explicitly stated, but it would constitute Greek letters as its primary identification within the context of Greek-letter organizations.
Step-by-step explanation:
The symbol for Sigma Gamma Rho Sorority, Inc. is not specifically mentioned, but it is important to note that sororities and fraternities often use Greek letters as their symbols. Sigma Gamma Rho is a historic sorority that is part of the National Pan-Hellenic Council, which includes nine International Greek fraternities and sororities collectively known as the Divine Nine. This sorority, like others, likely has multiple symbols and trademarks associated with it beyond just the Greek letters that make up its name.