National Education
Q: Ever wondered what the S.R. in our President's name stand for?
A: "Singapore Resident".
I'm surprised nobody ever made that up and put it to print before I made it up, but here's another thought provoking issue that someone told me about some time ago.
U've got your ID Card no. that starts with an S and ends with a letter right? Well, what does the 'S' mean then? And what's the rationale for the letter behind? It seems pretty elementary that the govt. would choose 'S' since it's Singawhatever, but contrary to popular believe, there's actually a math behind it. and here to plagarise the solution:
The Sg IC number consists of SEVEN (7) digits and a letter appended behind. This letter is calculated from the first SEVEN (7) digits using the MODULUS ELEVEN (11) method. This system is the most commonly used since it provides a high degree of security.
The steps involved in the computation are as follows:
Multiply each digit in the NRIC number by its weight.
Add together the above products.
Divide the resulting sum by ELEVEN (11).
Subtract the remainder from ELEVEN (11) to give the check digit.
In Singapore, the weight for the NRIC number is shown in the following table:
e.g. S 2 7 6 5 4 3 2 ?
S _ _ _ _ _ _ _ ?
The conversion (look-up) table to convert the check digit into the corresponding alphabet is shown below:
Check Digit 1 2 3 4 5 6 7 8 9 10 11
Alphabet A B C D E F G H I Z J
The last letter in the UIN/FIN is a check digit; serving as a means to ensure that the 7 numerals are not entered into a computer system in the wrong order. An algorithm is used to derive the check digit from the century prefix and the 7 numerals in the UIN or FIN. The algorithms and sample computer programs can now be obtained by filling up the electronic request form provided.
Come 21st century, the prefix of the Unique Identification Number (UIN) and the Foreigner Identification Number (FIN) will be changed from "S" to "T" and "F" to "G" respectively.
Why prefix "S" and "T" for UIN?
The current prefix for UIN is "T". It is the 20th letter in the alphabet which denotes UIN issued in this century (i.e. 2000 - 2099), while "S" is used for the last century.
What happen if we provide a UIN or FIN without the century prefix?
The century prefix is important as it makes the UIN or FIN unique. For example, the first child registered in the year of 2000 will bear a UIN "T0000001/E which differs from the first number "S0000001/I" first issued in the year 1966.






