How do I name an interface when the base word starts with an I?

I want to create an interface for "Items". Typicaly I would name an interface by adding and "I" prefix to a base word. But in this case my base word already starts with an I. Here are a couple ideas I've had

• IItem: Two I's
• Iitem : Vary the case
• ItemInterface: Skip the I prefix and write out Interface

What looks the best? Has anyone else run into this problem. If so what did you do?