The Korg 01/W was a workstation synthesizer, released in 1991, and was intended to replace the M1 and T series. The workstation/ROMpler was based on AI², an improved version of the AI (Advanced Integrated) Synthesis technology found in the M1. The success of the AI² architecture ensured it was used in the majority of subsequent Korg synths of the 1990s.
While the first initial of the name has always been pronounced "O" (the vowel) it is actually a zero.
Read more about Korg 01/W: Variations, Improvements Over The M1, Key Differences, Sonic Character, Options, Trivia