I have never heard of an I-20's can some one please explain what an I-20 is to me, as I am applying from the uk to study in Florida and the email says about an I-20's, but I have never heard this term before, can some one help? :confused:

There is an Interstate road in the southern US that goes east/west.
If it concern Language, this may help:
English Classes & Courses Miami Orlando Tampa Language schools Miami, English Lessons

For education purposes it is a form used towards a student visa.

Obtaining a Student Visa - Student Visas, F-1 Visa, Form I-20, Study in the US