The EL implicit objects

A Map of the scope attributes.

pageScope
requestScope
sessionScope
applicationScope

Maps of the request parameters.
param

paramValues

Maps of request headers
header

headerValues

Map of... cookies
cookie

A Map of the context  init parameters
(NOT servlet init param)
initParam

The only thing that is NOT a map. This is a reference to the actual pageContext object, which you can think of as a bean. Look in the API getter methods.
pageContext