Definition - What does I2P mean?
I2P wass originally short for the Invisible Internet project.
Techopedia explains I2P
I2P is an open-source free technology. Many applications, such as mail, IRC chat, peer-to-peer applications, file sharing and instant messenger, use I2P interface to allow anonymous communication and operation for both the individual users and organizations. I2P possesses its own internal network database, which is used to distribute contact and routing information in a securely.