NT Technology A more subtle example is the phrase "please RSVP", which can be seen to be redundant once it is realised that RSVP comes from the French phrase répondez s'il vous plaît, meaning "please respond".
Doubly redundant examples are also sometimes heard, such as "personal PIN number" and "CSS style sheets", and even more redundancy is possible. In one Dilbert comic strip, Dilbert states that the "TTP" project refers to "The TTP Project" (which is also an example of a recursive acronym).
The phenomenon also occurs with people whose initials form a nickname used in place of their forename, such as Jeb Bush: Jeb stands for John Ellis Bush. This only applies where the initials form an acronym as opposed to an initialism; nobody would say JFK Kennedy.
Some examples have become so common that to say otherwise can lead to confusion. The sentence "I can't remember my PIN" when spoken does not distinguish between a pin and the acronym PIN (and some dialects of English even have identical pronunciations for "pin" and "pen"). People are simply more used to hearing "pin number" and, though technically incorrect, is widely accepted in the spoken form. When written it is more important to get the usage correct. Examples have been found in bank correspondencies using the phrase "Personal Identification Number (PIN) number", a clear example of poor copy editing.
It should also be noted that certain occurrences are in the interest of clarity; for example, when discussing a mainframe computer's requirements, the acronym "AC" might refer to air conditioning or alternating current depending on the context; the redundant phrase "AC current" can be used to distinguish them. Likewise with "CSS style sheets", where CSS can also refer to the Content-scrambling system used on DVD Video titles. In addition, in many technical contexts, it is highly desirable to be specific as possible, even at the cost of some off-putting redundancy. However, many people believe that if clarity is sufficiently important to justify the redundancy, the full phrase, rather than the acronym, should be used.
Furthermore, many acronyms and initialisms are trademarks, and trademark law generally treats trademarks as adjectives, which should be used with a generic noun. Examples of correct usage include "CNN network" and "SPAM luncheon meat".
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