Symbols play a big role in our lives.  Letters, traffic-signs, punctuation marks, they're everywhere!
All symbols have meaning, and it has to be learned.  Failure to do so can affect our ability to understand everything that's based on them - including math!

Dyslexia is a reading disabily and aproximately 15% of people have it!  There is no ONE way to diagnose dyslexia, but it can easily be diagnosed because of common symptoms.