Roofing Terms & Definitions. Asphalt: A bituminous waterproofing agent applied to roofing materials during manufacturing. Back Surfacing: Fine mineral matter applied to the backside of shingles to keep them from. sticking. Blisters: Bubbles that may appear on the surface of asphalt roofing after installation.
Symbol(noun) an abbreviation standing for the name of an element and consisting of the initial letter of the Latin or New Latin name, or sometimes of the initial letter with a following one; as, C for carbon, Na for sodium (Natrium), Fe for iron (Ferrum), Sn for tin (Stannum), Sb for antimony (Stibium), etc.
A symbol is a visible sign of something else, whether a person, a thing, an idea, or of a mystical experience. The use of symbols in the Church is a very ancient practice, dating back to its very beginnings. On a very deep level, the Seven Sacraments have physical symbols to represent the reality of great mysteries that can not be seen.