What is AABB
AABB (formerly known as the American Association of Blood Banks) is an international, not-for-profit association representing individuals and institutions involved in the fields of transfusion medicine and cellular therapies.
She said that I could use ABAB or AABB to help me keep lines organized.
A rhyme scheme of AABB, one of the simplest possible.
At just four lines, the clerihew is a ragged biographical poem with a rhyming pattern of AABB.
Backwards reads like: BBAA
AABB contains 4 letters