Silver
Silver is a chemical element with symbol Ag (from the Latin "", derived from the Proto-Indo-European "h₂erǵ": "shiny" or "white") and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The metal is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining.
Gamma Sigma Delta
The Society's emblem is a key, which bears the words "The Honor Society of Agriculture" with the Greek letters ΓΣΔ as its insignia. These three letters stand for the Greek words, "Gaea", "Syndesmos" and "Demeter", which in turn were chosen for their symbolism, which is further explained as, ""The binding together of earth, the mother of all, and the practice of agriculture, and the arts relating thereto for the welfare of mankind.""