Standard Basis Vectors
The vector that is, i = (1, 0,0) is called a standard basis vector. In three dimensional (3D) space there are three standard basis vectors,
i^{→} = (1, 0, 0)
j^{→}^{ }= (0,1, 0)
k^{→} = (0, 0,1)
In two dimensional spaces (2D) there are two standard basis vectors,
i^{→} = (1, 0)
j^{→} = (0,1)
Notice that standard basis vectors are as well unit vectors.