The number of the National Identity Document includes eight digits and one letter for security. The letter is found by taking all eight digits as a number and dividing it by twenty-three. The remainder of this digit, which is between zero and twenty-two, gives the letter used for security. The letters I, Ñ, O, U are not used. The letters I and O are omitted to avoid confusions with the numbers 0 and 1, whilst the Ñ is absent to avoid confusion with the letter N. From the beginning up to the present day, DNIs are assigned to the different police stations. Thus, every police station that issues DNIs do not run out of numbers. If the station runs outs of numbers they are assigned a new lot, which is not necessarily the same as the previous lot. This contradicts the common belief that low new DNI numbers are actually old DNI numbers which used to belong to someone who has died. with number two being given to his wife,
Carmen Polo, and number three to their daughter,
Carmen Franco y Polo. The numbers four through nine are vacant to this day. The numbers ten through ninety-nine are reserved for the
royal family. Number ten was given to King
Juan Carlos I, number eleven for Queen
Sofía and numbers twelve and fourteen for
Infantas Elena and
Cristina, respectively. King
Felipe VI has the number fifteen, The number thirteen was left out due to superstition. There is evidence that there are thousands of people that share their DNI numbers from the time when its issuance was not computerized. == Elements ==