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Concept
RAS syndrome
Summary
RAS syndrome (where "RAS" stands for "redundant acronym syndrome", making the phrase "RAS syndrome" autological) is the redundant use of one or more of the words that make up an acronym in conjunction with the abbreviated form. This means, in effect, repeating one or more words from the acronym. Three common examples are "PIN number"/"VIN number" (the "N" in PIN and VIN stands for "number") and "ATM machine" (the "M" in ATM stands for "machine"). The term RAS syndrome was coined in 2001 in a light-hearted column in New Scientist.
Many style guides advise against usage of these redundant acronyms in formal contexts, but they are widely used in colloquial speech.
Examples of RAS phrases include:
DC Comics (Detective Comics Comics)
HIV virus (human immunodeficiency virus virus)
LCD display (liquid-crystal display display)
UPC code (universal product code code)
PUBG: Battlegrounds (PlayerUnknown's Battlegrounds: Battlegrounds)
Although there are many instances in editing where removal of redundancy improves clarity, the pure-logic ideal of zero redundancy is seldom maintained in human languages. Bill Bryson says, "Not all repetition is bad. It can be used for effect ..., or for clarity, or in deference to idiom. 'OPEC countries', 'SALT talks' and 'HIV virus' are all technically redundant because the second word is already contained in the preceding abbreviation, but only the ultra-finicky would deplore them. Similarly, in 'Wipe that smile off your face' the last two words are tautological—there is no other place a smile could be—but the sentence would not stand without them."
A limited amount of redundancy can improve the effectiveness of communication, either for the whole readership or at least to offer help to those readers who need it. A phonetic example of that principle is the need for spelling alphabets in radiotelephony. Some instances of RAS syndrome can be viewed as syntactic examples of the principle. The redundancy may help the listener by providing context and decreasing the "alphabet soup quotient" (the cryptic overabundance of abbreviations and acronyms) of the communication.
Official source
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