C# Naming Convention > Interface Name

PascalCase

Begin with an uppercase letter
If the name contains multiple words, capitalize first letter of every word e.g. GetXmlParser()
Mainly adjective phrases, occasionally nouns if type is abstract
Avoid acronyms and abbreviations
Preferably use prefix letter "I" to indicate the interface type e.g. ICounter

interface IBookable<T>
{  
    ...
}