I don't think this one needs to be explained, it's just obvious. The only weird thing I could make up is that the first G is written diffently from the second g. Why? Obvious again, because first one is in capital letters.
The Google doodle is linking to these page results ("louis braille birthdate").
Some Google functions
Writing "birthday" next to a famous person gives often directly the date of birth of that person. Though, "dob" (Date Of Birth) could as well be used. And if you really are interested in what I just said, you could use "Date of Death" as well, though, here "dod" doesn't work.
Louis Braille - Wikipedia
Louis Braille (January 4, 1809–January 6, 1852) was the inventor of the Braille writing system for the blind.
Read more
That's it for now. Stay tuned ;)
