An IQ is the score from an IQ test. In fact IQ tests do a pretty good job of measuring so-called general intelligence, g.
"1. Intelligence is a very general mental capability that, among other things, involves the ability to reason, plan, solve problems, think abstractly, comprehend complex ideas, learn quickly and learn from experience. It is not merely book learning, a narrow academic skill, or test-taking smarts. Rather, it reflects a broader and deeper capability for comprehending our surroundings--'catching on,' 'making sense' of things, or 'figuring out' what to do.
"2. Intelligence, so defined, can be measured, and intelligence tests measure it well. They are among the most accurate (in technical terms, reliable and valid) of all psychological tests and assessments. They do not measure creativity, character personality, or other important differences among individuals, nor are they intended to.
"3. While there are different types of intelligence tests, they all measure the same intelligence. Some use words or numbers and require specific cultural knowledge (like vocabulary). Others do not, and instead use shapes or designs and require knowledge of only simple, universal concepts (many/few, open/closed, up/down)."
--"Mainstream Science on Intelligence," Wall Street Journal, Dec. 13, 1994, p A18
http://www.psychpage.com/learning/library/intell/mainstream.html
BTW: 7/10. Simple, yet effective.