Java1.5: Class AbstractCollection E E - what does it mean?

Class AbstractCollection<E> <E> - what does it mean?
http://java.sun.com/j2se/1.5.0/docs...Collection.html
I also found <T> symbol e.g. Interface Iterable<T>
http://java.sun.com/j2se/1.5.0/docs...g/Iterable.html
????

http://java.sun.com/j2se/1.5.0/docs/guide/language/generics.html
http://java.sun.com/j2se/1.5/pdf/generics-tutorial.pdf

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