= Secret decoder ring
{wiki=Secret_decoder_ring}
A secret decoder ring is a novelty item, typically made of plastic or metal, that allows users to decode secret messages. Often associated with children's toys and collectibles, these rings usually feature a rotating disk or a series of letters and symbols that correspond to letters in the alphabet or numbers. When children turned the inner disk of the ring to align with a specific letter or symbol, they could decode messages written in a simple substitution cipher.
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