<P> In the PRC, an ID card is mandatory for all citizens who are over 16 years old . The ID number has 18 digits and is in the format RRRRRRYYYYMMDDSSSC, which is the sole and exclusive identification code for the holder (an old ID card only has 15 digits in the format RRRRRRYYMMDDIII). RRRRRR is a standard code for the administrative division where the holder is born (county or a district of a city), YYYYMMDD is the birth date of the holder, and SSS is a sequential code for distinguishing people with identical birthdates and birthplaces . The sequential code is odd for males and even for females . The final character, C, is a checksum value over the first 17 digits . To calculate the checksum, each digit in order is multiplied by a weight in the ordered set (7 9 10 5 8 4 2 1 6 3 7 9 10 5 8 4 2) and summed together . The sum modulus 11 is used as an index into the ordered set (1 0 X 9 8 7 6 5 4 3 2), with the first index being zero . The indexed value is the checksum digit . In 15 digit IDs, III is an identification number created through certain mathematical methods (the last digit might be an English letter, such as X). The ID card is used for residential registration, army enrollment registration, registration of marriage / divorce, going abroad, taking part in national exams, and other social or civil matters . </P> <P> In Hong Kong, a Hong Kong Identity Card (HKID) is mandatory for all residents aged over 11, subject to limited exceptions . HKID cards contain the bearer's HKID number, of which the standard format is X123456 (A). X represents one or two letters of the alphabet . The numerals may represent any Arabic number . A is the check digit, which has 11 possible values from 0 to 9 and A . The letters and numbers are not assigned arbitrarily . Additionally, one can view the international securities identification numbers organization that helps assign ISIN codes to securities . </P> <P> As World's biggest Biometric ID Programme, the Indian Government on 28 January 2009, established an Authority called the Unique Identification Authority of India (UIDAI) to issue a Unique Identification Number to all citizens and residents of India . UIDAI's Aadhaar card project gives each Indian citizen a unique 12 digit identification number, along with recording their biometrics such as iris scan and fingerprints on a UIDAI database and the card is being rolled out to all eligible citizens . The first Aadhaar number was launched in Maharashtra in the village of Tembhli, on 29 September 2010 . So far up to February 2016, 984 million (98 crores) Aadhaar Numbers have been issued . In October 2015, 93 percent of adult Indians have an Aadhaar card . There is no Aadhaar smart card but UID information of a card can be printed on a piece of paper or on a plastic card . After the recent order by the supreme court of India Aadhar card is not mandatory for availing public services . </P> <P> Before Aadhaar, the closest India has come to this is the Permanent account number (PAN), issued by the Income Tax Office, for purposes of tracking income and income taxes . It has gained use as a means of identification for activities like getting a phone connection . A total of 24.37 crore (243.7 million) PANs have been allotted as of 24 February 2016 . </P>

What is the national identification number in india
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