Retroflexa
Retroflexa, also known as retroflexion, is a phonetic phenomenon where the tongue tip curls back towards the roof of the mouth, rather than moving forward or remaining in its neutral position. This movement is crucial in the production of certain sounds in many languages. Retroflex consonants are characterized by this backward curling of the tongue tip. For example, the sound represented by the letter "r" in words like "run" or "red" in English is a retroflex consonant in some dialects, particularly in Indian English and some African languages. Retroflexion is also found in the production of the "sh" sound in words like "ship" or "shop" in certain accents of English. The retroflexion of the tongue tip allows for the creation of distinct sounds that are not possible with a flat tongue. This phonetic feature is significant in linguistics as it contributes to the diversity of sounds in human language. Retroflex consonants are typically denoted with a hook or a retroflex symbol above the letter representing the consonant in the International Phonetic Alphabet.