In genius IQs, IQ key refers keys to the subscript marks and letters used in the various IQ citations found in the Hmolpedia genius rankings pages. The following is a key to the icons and IQ subscripts used herein:

Symbol	Key

	Baez crackpot index score
	(or AII IQ) IQ development from 17 to 26; a Catherine Cox ranking technique
$IQ_B \,$	Buzan IQ
	Buzan IQs reformulated (Ѻ) into ratio IQs by the MegaSociety (2005).
$IQ_C \,$	Cox IQ
$IQ_{CB} \,$	Cox-Buzan IQ
	A claimed IQ (compare: auto-estimated IQ) of an existive person.
	An IQ derived by "comparison to another person[s]", with existing IQ estimate, method.
	The mean IQ of Cox IQ + Platt IQ + Buzan IQ of a genius common to all three (see: Cox-Buzan-Platt IQ).
$IQ_D \,$	Deviation IQ
	Score derived from 1999 Esquire “Gεπ1us Tεst” IQ. [1]
	An IQ calculated or estimated by Economakis Michael (2008/2012).
	An "existive IQ".
[add]	A "feigned IQ" is a over-estimated IQ.
$IQ_G \,$	Guinness Book IQ
	A genius-level IQ (140+) by default per cited opinion.
	An IQ determined by Leta Hollingworth (1942).
	A "highest IQ ever" nominee, contender, or supposition, e.g. Robert Hooke (2009) (Ѻ), or “highest IQ ever recorded”, e.g. Kim Ung-Yong (1977) (Ѻ)
	An IQ estimate from John Platt's 1962 "The Coming Generation of Genius".
$IQ_M \,$	Mega Test IQ
	An IQ calculated by Maud Merrill, one of the three main IQ rankers, along with Catherine Cox and Lewis Terman, in the determination of the IQs of the top 300 geniuses of the Cattell 1000, as found finalized in the Cox IQs.
	Mensa Test IQ
$IQ_O \,$	Other IQ, e.g. cited at IQ references, or per numbered reference.
$IQ_P \,$	Psychologist tested IQ
	The mean IQ of the posthumous genius (198\|#32), using an average of Da Vinci (IQ:200\|#7), Spinoza (IQ:180\|#94), Goethe (IQ:225\|#1), Nietzsche (IQ:190\|#35), and Tesla (IQ:195\|#19).
	An IQ estimate based on Quora answer submissions.
	A "ratio IQ", namely an IQ determined by an mental age by an actual age, of some designed age specific test, times 100; this is the Terman IQ formula, in short.
	A "real IQ", i.e. an IQ that matches up with reality, as compared to: feigned IQ, paper IQ, inflated IQ, fake IQ, etc., as best data available to sensor input furnishes.
	A self-estimated IQ (e.g. Bertrand Russell, Buffon, etc.)
	Stanford-Binet extrapolated IQ
	An IQ estimated by American psychologist Dean Simonton, e.g. as are found on the American presidents page (or in some locations). [3]
	In May 2015, Lindsey Cook, a data editor at US News and World Report, took the "mean" of the four IQ estimates (IQ at age 1-17, and 18-26; corrected and uncorrected), for each president, from the Simonton (2006) study. [5]
	The Feb 2019 personal “Top 100 Geniuses List” (Ѻ) made by Reddit user u/SpergingKermit, a 15-year-old individual interested in geniuses, who does not believe in chance (Ѻ), but is agnostic about god, or something to this effect; the list was posted, by request of Thims, into the r/RealGeniuses forum; plus projections (10+) (Ѻ) (10 Feb).
	A the mean IQ of a social Newton, which based on the average of the known IQs of 14 of the top 55+ social Newtons (Feb, 2017) is 186.
	The IQs listed on Sigma Society IQ list (Ѻ) listing sources and discussion.
$IQ_T \,$	A Terman IQ, i.e. an IQ calculated by Lewis Terman.
	A "theoretical IQ", basically what one's IQ could be "in theory", in the future, as an adult, after one has accomplished something of genius merit, but is a thing only the future can discern, retrospectively; e.g. if we take the statement "I taught [Laurent Simons] when he was six and we studied at the level of a 16 year-old" (Wilkes, 2019) (Ѻ), we can calculate a “theoretical IQ” of 267, per age ratio IQ method; this, however, is what is classified as an “inflated IQ” per reasons that IQ calculations past the 225 range don’t match up with reality, i.e. the “real IQs” of real historical geniuses, as determined via meta-analysis, as shown in the top 1000 geniuses rankings.
	An Uberman IQ, mean averaged at 186, generally.
$IQ_W \,$	An IQ estimated by Herbert Walberg et al. [2]
	YouTube community "IQ: 200+ \| Smartest person ever", video thumbs up rankings/votes
$IQ_? \,$	Guesstimate IQ (some shown in red, e.g. estimated fit per extrapolation of established previously made Cox-Buzan IQ estimates.
	Won a Nobel Prize; two medals signifies two wins.
[:#]	Nominated for a Nobel Prize but did not win; number signifies number of times nominated.
	Won a Fields Medal, the highest award in mathematics, for thinkers under the age of 40.

See also
● IQ subscript table on the IQ: 200+ page.

References
1. Ferry, Jim, Lygeros, Nik; McGaug, Bill; Preston, Heather; Rottler, Andreas; Scoville, John; Smith, Tommy; and Wahl, Patrick. (1999). “Gεπ1us Tεst”, Esquire, Nov.
2. Walberg, Herbert J. Tsai, Shiow-Ling, Weinstein, Thomas, Gabriel, Cynthia L., Rasher, Sue, P. Roesecrans, Teresa, Rovai, Evangelina, Ide, Judith, Trujillo, Miguel, and Vukosavich, Peter. (1981). “Childhood Traits and Environmental Conditions of Highly Eminent Adults”, Gifted Child Quarterly, 25(3):103-07.
3. (a) Simonton, Dean K. (2006). “Presidential IQ, Openness, Intellectual Brilliance, and Leadership: Estimates and Correlations for 42 U.S. Chief Executives” (pdf), Political Psychology, 27(4):511-26.
(b) IQ estimates [of US Presidents] by academics (section) – Wikipedia.
4. Piatt, John R. (1962). “The Coming Generation of Genius” (Ѻ)(Ѻ)(Ѻ)(Ѻ), Horizon, 4(4):70-75.
5. Cook, Lindsey. (2015). “Presidential IQs and Success in the Oval Office” (Ѻ), US News and World Report, May 27.