CAD tip # 5707:

To enable predefined command aliases set the option "Use default multi-character Command Aliases" on the Keyboard tab of the Customize dialog (Tools > Customize). Here you can also add your own aliases.

Entered aliases are displayed (in red) in your Inventor statusline. But you can also enable something like an Inventor "commandline" and enter the aliases in this window. You can find this "commandline" option ("Show command alias input dialog") on the General tab of the "Application options" dialog (Tools > Application options, OP).

In this command window you can see the list of commands matching the entered characters of the alias: