F开头的Fin是什么证件

FIN=foreign identification number

意思是 歪果仁 身份识别号码

不好意思，表达错了，想问的是通常中国人的FIN 号码都是以G开头的，以F开头的Fin号码是怎样区分的，代表什么？

2000年以前来的，一直没有换证件就是F开头的。就和新加坡证件2000年以前是S，千禧年后的宝宝是T开头的。
楼下为官方解释～

This is a letter that can be "S", "T", "F" or "G" depending on the status of the holder.
 Singapore citizens and permanent residents born before the year 2000 are assigned the letter "S". 
Singapore citizens and permanent residents born in and after 2000 are assigned the letter "T". 
Foreigners holding employment or student passes issued before 2000 are assigned the letter "F". 
Foreigners holding employment or student passes issued in and after 2000 are assigned the letter "G"

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