Thanks for getting in touch. We would advise against using symbols as a prefix, and to just instead name space them as a convention in your projects. Pick a short namespace a few letters or short words.
I thought that the symbol prefix might be a bad idea...The problem for us with OD. and App. namespace oriented approach is that many of the App. variable names correspond to appSettings which don't currently have a prefix. For instance, the application has an appSetting with the key 'DataTool/RoleID'. As I understand it, If I want Octopus Deploy to update this appSetting then my variable has to be named 'DataTool/RoleID'. Is that right?