Okay, it's a rhyme-sceme that Shakespearean Sonnets follow.

Basically, each line has ten syllables, and there are 14 lines. The rhyme scheme is simple; the last word of each line must rhyme with the last word of the second line after it. For example:

Blah blah blah Blah blah blah Blah blah blah Nine

Blah blah blah Blah blah blah Blah blah blah Rome

Blah blah blah Blah blah blah Blah blah blah Fine

Blah blah blah Blah blah blah Blah blah blah Home

Yeah. .3.