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What is UIN? What is the difference between a UIN and FIN?

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Source: https://www.ica.gov.sg
UIN refers to Unique Identification Number which is issued by Immigration & Checkpoints Authority (ICA) to Singapore citizens and Singapore permanent residents only. 
 
FIN refers to Foreign Identification Number which is issued to foreigners with Long-Term immigration passes in Singapore (e.g. Student's Pass, Long-Term Visit Pass, Work Pass, Work Permit etc.) by the ICA or the Ministry of Manpower (MOM). 

This information provided here is sourced from the ICA website.

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