No go

No go or Nogo may refer to:

• Nogo A, B, C, or Nogo-66, isoforms of a neurite outgrowth inhibitory protein Reticulon 4.
• No-go area, a military or political term for an area to which access is restricted or travel is dangerous
• No-go pill, a military term for a hypnotic medication taken by soldiers to ensure they are well rested for missions
• go/no go, a process or device used in quality control
• Go-NoGo gauge, an inspection tool used to check a workpiece against its allowed tolerances
• No-go theorem, a theorem that shows that an idea is not possible even though it may look attractive
• Nogo, an alternative name for an African tree more commonly called Lecomtedoxa
• Nogo (drum), a Korean drum

https://en.wikipedia.org/wiki/No_go