Canon EOS 600D Instruction Manual page 207

The total number of a rating can be displayed up to 999. If there are 1,000 or
more images for a rating, [###] will be displayed.
Taking advantage of ratings
With [4 Image jump w/6], you can display only the rated images and
movies.
With [4 Slide show], you can playback only the rated images and
movies.
With Digital Photo Professional (provided software, p.302), you can
select only the rated images and movies.
With Windows Vista and Windows 7, you can see the rating with the file
information display or the provided image viewer.
3 Setting Ratings
207