The Accounting and Corporate Regulatory Authority (ACRA) is the national regulator of business entities, public accountants and corporate service providers in Singapore. Each corporate entity receives a Unique Entity Number (UEN), which should be used as the identifier.
"Registering or setting up a company in Singapore is accomplished through contacting Accounting and Corporate Regulatory Authority (ACRA)." 
"From 1 January 2009, all entities that are registered in Singapore, such as
businesses, local companies, limited liability partnerships (LLPs), societies,
representative offices, healthcare institutions and trade unions, will have a
Unique Entity Number (UEN) as its identification number. "