The bundle of differential forms, at each point, consists of all totally antisymmetric multilinear maps on the tangent space at that point. It is naturally divided into "n"-forms for each "n" at most equal to the dimension of the manifold; an "n"-form is an "n"-variable form, also called a form of degree "n". The 1-forms are the cotangent vectors, while the 0-forms are just scalar functions. In general, an "n"-form is a tensor with cotangent rank "n" and tangent rank 0. But not every such tensor is a form, as a form must be antisymmetric.