899: Number Line

Explain xkcd: It's 'cause you're dumb.
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Number Line
The Wikipedia page "List of Numbers" opens with "This list is incomplete; you can help by expanding it."
Title text: The Wikipedia page "List of Numbers" opens with "This list is incomplete; you can help by expanding it."


  • Negative numbers just wanna be positive numbers or some joke of that nature.
  • The Golden ratio is the length to width of rectangles that are most pleasing to the eye. The number which is about 1.61803, is the numeric value is called "phi", named for the Greek sculptor Phidias. The Parthenon is a perfect rectangle in size. The number of spirals on the head of Sunflowers are also said to exhibit the Golden mean/ratio.
  • Forbidden Region and Unexplored are both map jokes.
  • e(Euler's number) is 2.71828... and π(pi) is 3.14159265...
  • 2.9299372 is a President's Day reference because it is the average of e and pi just as the American President's Day is always observed on the 3rd Monday of February (between George Washington and Abraham Lincoln's birthdays). (For non-US residents, those were the 1st and 16th Presidents of the USA.)
  • Site of the Battle of 4.108 is not a reference to anything I think it is another map joke.
  • You do see often on TV and in the media that "It has been 7 years..." or "In the last 7 years..." etc.
  • 8 is not the largest even prime. 2 is. I'm sure this is like the 0.99... entry above, Randall is trying to start internet battles over the subject. Here are all the prime numbers on the chart above: 2, 3, 5, 7
  • The last entry seems to be a reference to Discrete Math, which rarely deals with numbers higher than 9. Randall again is trying to incite a internet flame war with Mathematicians who study other forms of math.


(( number line ranging from -1 to 10 ))
(( arrow pointing left, towards negative numbers )) Negative "imitator" numbers (do not use)
(( line right before the number one )) 0.99... (acutally 0.0000000372 less than 1)
(( line at the golden ratio )) Φ - Parthenon; sunflowers; golden ratio; wait, come back, I have facts!
(( line at a region between two and 2.2 )) forbidden region
(( line at Euler's number )) e
(( line a bit before 3 )) 2.9299372 (e and pi, observed)
(( line at π )) π
(( line at 3.5 with a ribbon as the numeral )) Gird - accepted as canon by orthodox mathematicians
(( line a bit after 4 )) site of battle of 4.108
(( blob between 4.5 and 6.5 labeled unexplored ))
(( line at seven )) Number indicating a factoid is made up ("every 7 years...", "science says there are 7...", etc)
(( line at eight )) Largest even prime
(( line at 8.75 )) If you encounter a number higher than this, you"re not doing real math

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Where does sqrt(-1) go? 19:07, 2 January 2013 (UTC)

It goes up (literally above 0). A number line can be extended to a complex plane with sqrt(-1) as the unit of measurement in the vertical direction. Or at least, that's where it actually goes. I don't know where Randall would put it. 01:04, 5 March 2013 (UTC)

I'm sorry...are you indicating the ACTUAL location for an IMAGINARY number? -- ‎ (talk) (please sign your comments with ~~~~)

Yes, that's exactly where it is (up to switching clockwise for counterclockwise). There is nothing strange about providing a location for imaginary or complex numbers, the location described is logical, and the adjective 'imaginary' is an artifact of nomenclature and nothing more. 20:40, 30 March 2013 (UTC)

In fact, complex numbers are nearly more real than real ones! Complex analysis really opened my eyes to how much "stepping out" can help in solving problems. The complex notion of analyticity yields fruit in real analysis. Extensions to hypercomplex numbers are weirder, however. --Quicksilver (talk) 20:27, 17 August 2013 (UTC)

Analyticity must be an imaginary word, and therefore would be found one unit directly above any dictionary. 14:19, 9 October 2013 (UTC)

Oh my god, I can't believe how hard I laughed at that. Would an imaginary friend actually be above you then? I'm going to use that sometime. 21:25, 24 April 2014 (UTC)
"I'm sorry, you have reached an imaginary number. Please rotate the phone by 90 degrees and try again." 17:01, 21 October 2017 (UTC)

Is unexplored a map reference? Halfhat (talk) 17:53, 13 January 2014 (UTC)

Note that the digits 5 and 6 do not show up on any of the numbers in the comic, reinforcing the fact that the integers 5 and 6 are unexplored. Blitzer (talk) 02:34, 15 May 2014 (UTC)

So the 5th digit of pi can not be known either? Tharkon (talk) 03:56, 12 July 2014 (UTC)
The whath digit of pi? 01:59, 1 January 2015 (UTC)

Thank God (or someone else, I'm not choosy) that the SCP link here still works. The rest of the site's gone private. (talk) (please sign your comments with ~~~~)

It appears that Wikipedia had noticed the implications of the title text here. The message now says that it might never be complete, but can be expanded with reliably sourced articles. I'm not 100% sure it's due to Randall's involvement, but I like to think so. -- 22:01, 9 December 2014 (UTC)

I am not American, but the linked Wikipedia Article does not support the claims about president's day being observed between the 2 birthdays of Washington and Lincoln in general, but just that in some states Lincoln is also referenced on that day. Even if it was put as a day between these birthdays by definition and on purpose, I do not see the reference here... Especially as this number is given as specific, unlike presidents day, which can occur in a range of days... Someone who knows more of American culture, and also what "observed" (which would link it to holidays....) can mean in English language please revert this. --Lupo (talk) 12:41, 18 September 2019 (UTC)