Â· 43 comments. in Facts. An intelligence quotient, or IQ, is a score derived from one of several standardized tests designed to assess intelligence. The abbreviation âIQâ comes from the German term Intelligenz-Quotient, originally coined by psychologist William Stern.
Lower explosive limit. Lower explosive limit (LEL): The lowest concentration (percentage) of a gas or a vapor in air capable of producing a flash of fire in presence of an ignition source (arc, flame, heat). The term is considered by many safety professionals to be the same as the lower flammable limit (LFL).
A local exchange carrier (LEC) is the term used in the U.S. for describing the telephone company which operates within a local area and provides telecommunication services within that area. Local exchange carriers started across the U.S. following the breakup of the Bell system due to antitrust regulations.