- "E" redirects here. For the Irrational character, see Euler's Constant.
- "I" redirects here. For the number character, see Imaginary Number.
Variables, also referred to as Letters, are a species that reside in the Equation Playground, in the genus Algebraliens. X is the most notable variable, mainly due to their role as the co-host of Battle for BFDI and Battle for BFB.
Known members[]
- a
- b
- D
- d
- e
- f
- G
- h
- i
- j (BlueJay/jaysillyboy)
- k
- N
- T
- W
- X
- Y (whY)
- y (non-canon)
- Z
- z
Gallery[]
Normal[]
Cave drawings[]
Season 1[]
Season 2[]
Possibly Variable[]
Trivia[]
- It was widely believed that Variables and Integers were the same species, until "The Number Playground Chronicle!" had clarified that the two were in fact separate species.
- Despite having similar characteristics, the GO Guys do not appear to be variables.
- All variables apparently have numerical values.
- In "The Official Four and X Plush" X says that all variables' value changes daily. Since this short is non-canon, it's unknown if this is true or if values stay the same after they're solved.
- This was also mentioned in "The LOST NEWSPAPERS of Four and X".
- Two variables can actually represent the same letter, being uppercase and lowercase versions. One example of this is D variable and d variable, being two completely distinct colors.