this-command-keys-shift-translated

this-command-keys-shift-translated is a variable defined in `C source code'.
Its value is

nil

Documentation:
Non-nil if the key sequence activating this command was shift-translated.
Shift-translation occurs when there is no binding for the key sequence
as entered, but a binding was found by changing an upper-case letter
to lower-case, or a shifted function key to an unshifted one.