Letter: Pinned down

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The Independent Culture
Sir: Nicholas Lezard (Irritations of Modern Life, 17 March) is guilty of another irritation when he refers to a person's "PIN number". "PIN" is stands for "personal identification number", so "PIN number" stands for "personal identification number number". This irritant can also be seen in such usages as "AC current" ("alternating current current") and "laser light" ("light amplification by stimulated emission of radiation light").

A J EDWARDS

Tortola, British Virgin Islands.

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