Tweedledum and Tweedledee are fictional characters in an English language nursery rhyme and in Lewis Carroll's Through the Looking-Glass, and What Alice Found There. Their names may have originally come from an epigram written by poet John Byrom. The nursery rhyme has a Roud Folk Song Index number of 19800. The names have since become synonymous in western popular culture slang for any two people who look and act in identical ways, generally in a derogatory sense.
Tweedledum and Tweedledee Agreed to have a battle; For Tweedledum said Tweedledee Had spoiled his nice new rattle. Just then flew down a monstrous crow, As black as a tar-barrel; Which frightened both the heroes so, They quite forgot their quarrel.
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Tweedledum and Tweedledee
