**Algebralians**^{[1]} (also spelled "Algebraliens", a portmanteau of "algebra" and "alien", and "Numeral species" in the book in Thanks for 2,000,000 Subscribers!) are colorful, genderless, sentient beings resembling mathematical symbols (mostly numbers) that originate from the Equation Playground. They are notable for their appearances in "X Finds Out His Value" (XFOHV), "The Number Playground Chronicle!", The Power Of Two, and *Battle for BFB*.

The only canonical appearances of Algebralians are from *Battle for Dream Island*. Their appearances in the pre-BFDI comics and XFOHV are considered not canon, meaning they are not part of the central universe and timeline of events.

## Species[]

### Integers[]

*Main article: Integers*

Integers are based upon numeric digits. Integers made their debut in "X Finds Out His Value", with One, Three, Four, Five, Six, Seven, and Eight making their first appearances. In "The Number Playground Chronicle!", its spiritual successor, Two, Zero, and Nine are introduced. In "Thanks for 1,000,000 subscribers!", Ten is introduced. In "Thanks for 1,500,000 Subscribers!", Fifteen and Fourteen are introduced, along with the ability for integers to merge. In "Thanks for 2,000,000 subscribers!", Twelve and Sixteen are introduced.

### Variables[]

*Main article: Variables*

Variables are based upon mathematical variables. Most use or are represented by letters in the Latin alphabet. X was introduced in "X Finds Out His Value" as the very first variable, with N Variable, Y Variable, and Z Variable being introduced in "The Number Playground Chronicle!".

## Non-canon[]

### Irrationals[]

*Main article: Irrationals*

Irrationals were introduced in "The Number Playground Chronicle!". One member, Pi, served as a journalist and writer for the titular newspaper, writing on articles such as Five and Three not catching balls. Irrationals reappeared in Pie vs Pi and had a larger role.

### The Number Playground Chronicle![]

These species of Algebralian have exclusively been seen in The Number Playground Chronicle! and have not been confirmed to exist within other canons containing Algebralians.

#### Polygons[]

*Main article: Polygons*

Polygons were introduced in "The Number Playground Chronicle!". They are based upon the first 11 polygons by sides minus heptagon (7 sides) and decagon (10 sides). They did not make any more appearances after their debut.

#### Operators[]

*Main article: Operators*

Operators were introduced in "The Number Playground Chronicle!". They are based upon mathematical operators. Divide Operator was the only operator to have been physically seen, until Plus, Positive, and Asterisk were introduced as recommended characters. Plus, Multiply, and Divide were later seen in Subscriber Specials as inanimate objects.

##### Inanimate[]

#### Polyhedrons[]

*Main article: Polyhedrons*

Polyhedrons were introduced in "The Number Playground Chronicle!". Octahedron Polyhedron is the only polyhedron to have been physically seen.

#### Fractions[]

*Main article: Fractions*

Fractions were introduced in "The Number Playground Chronicle!". They are the only species introduced in the aforementioned comic to have never been visually depicted.

## Unknown species[]

These Algebralians Have an Unknown Genus. Most of These Characters are Recommended With the Exception of Eighth Note and Infinity, And Ninty Six not Even Being a Math Symbol.

## Cave drawings[]

## Trivia[]

- The term "Algebralian"/"Algebralien" was initially coined by fans of the show. It was later adopted by Cary Huang himself, solidifying the species' nickname as official.
- Algebralians are the only characters (and species for that matter) in the series who do not identify themselves with a specific gender, due to their species not having it
^{[2]}. - Algebralians might have very fragile skin. In BFB 17, Two claims that glue can damage an Algebralian's pelt, even though they never state how.
- Algebralians appear with sclerae (the whites surrounding their pupils), whereas the anthropomorphic objects are shown only with pupils.
- Algebralian digits 1-8, with the exception of five are colored based off of numbers from the game Minesweeper. This is stated in the credits of X Finds Out His Value.
- Some algebralians have been shown to be able to retract limbs. In some scenes, Two, Pi, Fourteen, Tau, and more have been seen without certain limbs that they usually have.
- According to The Number Playground Chronicle!, Four and X are the only algebraliens to have phones, but in "Why is the BFDI Mouth Everywhere?" Two has a phone.
- Like objects, Algebralians can die, as proven in several BFB episodes where Four kills X by despawning him.

## Calculations[]

As most algebralians are numerical characters, they are able to fuse and subtract with each other as if they were mathematical sums. So far, six instances of algebralian calculations have been shown on the channel.

- "Four Goes Too Far", where Four and Donut (acting as Zero) multiplied to create Zero, eliminating Four. The equation appeared to not have a proper multiplication symbol (×), though it is theorized that A Better Name Than That's sled acted as a multiplication bracket.
- Thanks for 1,500,000 Subscribers!, where Six and Nine added together to create Fifteen.
- It is confirmed in this video that, whenever two algebralians combine, part of one algebralian enters the other: such as Six and Nine becoming a blue-grey gradient of 15, and Four becoming Donut's filling.

- Thanks for 2,000,000 Subscribers!, where Two divided Fourteen into two green sevens. And where Seven and "Green Seven" were added together to create Fourteen. It also had two green sevens added back to Fourteen off-screen.
- Pie Vs Pi: The Pi Day Massacre, where Pi was divided by Zero, leaving only Zero and eliminating Pi.

## References[]

- ↑ Taken from the Jacknjellify Patreon tier description for High Quality Recommended Character
- ↑ In Enter the Exit, Four states that they "Don't have [Gender] where [He's] from," confirming that his species lacks it.

## See Also[]