I am looking for a symbol to represent the operation of taking unique values from a vector. So, say the symbol was $\theta$:
$v = [0, 0, 0, 1, 1, 1, 3, 1, 2, 0]$
$\theta(v) = [0, 1, 3, 2]$
Or is this something that just isn't defined?
Thanks
EDIT
Thanks all for your help here. Your answers and comments have led me to realise that doing this operation on a vector is not really what I want to do; using a set makes much more sense logically.
(Background: I have many coordinates $\boldsymbol{p}_i = [x_i, y_i, z_i]$ in 3D space, which I then perform a rounding function on so they are equally sampled. However, there will be many duplicates points at each new coordinate, so I remove the duplicated $\boldsymbol{p}$ points to get the final set of points. So it makes sense to define a set $\boldsymbol{P} = \{\boldsymbol{p}_1, ... \boldsymbol{p}_i, \cdot \boldsymbol{p}_n\}$).