Findings:

• cm (user)
• CMS
• Cm
• C#m
• C#m/E
• cmm (user)
• cms (user)
• C-M (user)
• CM Miami (user)
• Coolermaster CM Storm Quickfire Rapid
• .CM
• Cu

If you Log in you could create a "cu cm" node. If you don't already have an account, you can register here.