I wish there was a standard out there rather than having to discover/invent it ourselves. In my case, I need such a naming that can immediately shows and . On top of that, many times I will need to use that dictionary in a loop, so I will need similar naming to represent each of its element. For the time being I use something like below. I'm aware that not everyone aggress with the usage of _ (even I try to avoid it).

foreach (country_provinces in countries_provinces)
{
  ...
}