What is IBM top gun?

Could you please clarify for me what exactly is meant by "IBM Top Gun"? Is it a specific program, product, or team within IBM that's renowned for its excellence? If so, could you provide some details about its purpose, achievements, or notable contributions to the industry? Alternatively, is it a colloquial term used to describe a highly skilled or influential individual within IBM? I'm intrigued and would appreciate any additional information you can provide.