Those are generic data types.
For example IDictionary<Tkey, TValue>
means you can replace those with any type.
IDictionary<int, string>
IDictionary<int, int>
IDictionary<string, string>
There is no difference in calling IDictionary<K, V>
C# has used the naming convention of TKey as in C++ template to represent generics rather than just using single characters.
Hope that helps
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