Itanium

Itanium: An Intel microprocessor that uses explicitly parallel instruction set computing and 64-bit memory addressing.

Itanium-based refers to systems or platforms that are based on the Itanium processor. Itanium 2-based refers to systems or platforms that are based on the Itanium 2 processor. Itanium architecture-based refers to systems or platforms that are based on the Itanium and Itanium 2 processors.