# turn proc (applied to a vector)

Source: https://ref.dm-lang.org/proc/turn/vector
Added in BYOND 516.

### Format
- `turn(vector/A, angle)`
- `turn(vector/A, vector/B)`


### Returns
> A new rotated vector.

### Args
- `A`: The vector to rotate.
- `angle`: An angle to turn a vector counter-clockwise in 2D.
- `B`: A vector to rotate around (left-hand rule).


All angles are in degrees.

When the argument is an angle, the result is a copy of vector A, rotated in 2 dimensions counter-clockwise.

When the argument is a vector, the result is rotated in 3 dimensions around vector B using the left-hand rule (thumb pointed in the direction of B, rotation following curled fingers). The angle of rotation is the length of B, in degrees.

### See also
- [vector](https://ref.dm-lang.org/vector/index.md)
- [vector proc](https://ref.dm-lang.org/proc/vector.md)
- [Turn proc (vector)](https://ref.dm-lang.org/vector/proc/Turn.md)