Entities beginning with “ab” encompass a wide array, from historical figures like Abraham Lincoln to exotic animals like the Abyssinian cat. Explore global cities like Abu Dhabi, lesser-known places like Abilene, scientific concepts like abrasion, and abstract ideas like abstract algebra. Uncover the significance of medical acronyms like ABIM, explore acronyms in defense and technology, delve into arts and entertainment with “Abby” and “Abba,” and examine psychological concepts like ability and abandonment.