I've always disliked that rule (most coding standards I saw, had such a rule) about starting names of interfaces with "I". It feels like the Hungarian notation is back. And I found myself using that leading "I" in such a way that the letter really means something. For example, instead of IInputValidator, I would create an interface named IValidateInput. This is a very reader-friendly name, in my opinion: it doesn't force you into using a word that doesn't really exist ("validator" is, obviously, a verb turned into a noun; it's not in the dictionary, according to Merriam-Webster). Also, this name explains what the implementer does, and explains in a natural way. "What is your responsibility?" - you ask the interface. "I validate input", - it replies.
Of course, all of the above applies only if the interface describes something that does one thing. In general, I prefer nouns and adjectives when naming interfaces.
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