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.
In contrast to a physical sign, symbols represents something else by association, resemblance or convention... something visible representing something invisible. For example, the well-known image of a dove symbolizes peace, rather than just depicting the bird itself. Common symbols that are not considered signs include a dove to represent peace, a cross to represent Christianity or even punctuation marks such as the question mark or the exclamation mark. Sometimes the words sign and symbol are used as synonyms.