Tweedledum and Tweedledee are two characters from the famous novel "Alice's Adventures in Wonderland" written by Lewis Carroll. Over the years, the phrase "Tweedledum and Tweedledee" has become a popular idiom that refers to two people or things that are very similar in appearance, behavior, or nature. Some synonyms for this phrase include "identical twins," "two peas in a pod," "mirror images," "lookalikes," "carbon copies," "clones," "duplicates," "twins," "doubles," and "partners in crime." Whether used in literature, music, or everyday conversations, Tweedledum and Tweedledee have become an iconic representation of two indistinguishable entities.