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History
Personal identification number
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A personal identification number (PIN), or sometimes redundantly a PIN number or PIN code, is a numeric passcode used in the process of authenticating a user accessing a system.
When using this credit card terminal, a VISA cardholder swipes or inserts their credit card, and enters their PIN on the keypad
When using this credit card terminal, a VISA cardholder swipes or inserts their credit card, and enters their PIN on the keypad
RAS syndrome
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RAS syndrome 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" and "ATM machine". The term RAS syndrome was coined in 2001 in a light-hearted column in New Scientist.
"ATM machine" is a common example of RAS syndrome
"ATM machine" is a common example of RAS syndrome