Difference ruby-1.9.2 and ruby 1.9.2-mri with rvm?

This must be specific to your installation (maybe you installed 1.9.2 at one point with a custom name?), since rvm list just lists your locally-installed Rubies. All the rubies you listed are MRI Rubies. Here's the output of rvm list known which will display all available Rubies to install.

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