A common mistake made in conversation and correspondence where the word "number" is stated twice, once in the acronym PIN and once in "the clear".

Usage: "Enter your PIN number."

An example of a LA (Leaky Acronym).

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In bowling, the descriptive number given to each of the target pins.

Ten bowling pins are set up in a four row triangle according to the diagram below.

          Bowler Here
               |
               |
               V
         |          |
         |          |
         |          |
         |          |
         |     1    |
         |    3 2   |
         |   6 5 4  |
         | 10 9 8 7 |

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