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Wikipedia Jokes
Carl’s number is often described as the largest number that has ever been seriously used in a Wikipedia article. It is too large to be written in scientific notation because even the digits in the exponent would exceed the number of bits in the Wikipedia hard drive, so it needs special notation to write down. Carl’s number is much larger than other well known large numbers such as a googol and a googolplex, and even larger than Graham’s number, another well-known extremely large number.
Carl’s problem
Carl’s number is connected to the following problem in the branch of mathematics known as “just way too many dimensions”:
Consider an n-dimensional universe, such that n0 = phi. Then begin to increase n indefinitely. As n approaches 42, a Graham’s number-dimensional universe collides with the n-dimensional universe to unite and form a single m-dimensional universe. What is the most probable value of m?
Although the solution to this problem is not yet proved, Carl’s number is the most probably solution and is the generally accepted answer. Carl found this when attempting to solve the first ever Graham’s number-dimensional Rubik Cube.
Definition of Carl’s number
Carl’s number Q is defined as follows:

Historical significance of Q
Although the exact reason for picking Q is still unknown, it is often rumored that Carl picked the letter Q due to a complicated vector problem involving more dimensions than there are fundamental particles in the visible universe. To get around this, Carl created the Q notation, such that Q is everything. (The one and only contribution of User:MyNameIsCarl and, incidentaly much (I can’t express how much) smaller than Grahams number.)