What is a field of odd characteristic? I have some problem finding info about what a field of odd characteristic is?
An example:

Let $K$ be a field of odd characteristic. In [5], Bernstein and Lange
  introduce Edwards curves defined by  $x^2 + y^2 = c^2(1 + dx^2y^2)$
  where $c, d ∈ K$ with $cd(1 − dc^4) \neq 0$. In [1], this form is
  generalized to twisted Edwards form defined by
$$ax^2 + y^2 = 1 + dx^2y^2$$


The characteristic of a field is always a prime number.
Thus, a field of odd characteristic is a field having characteristic $p$ with $p\ne2$.
