4D: 4-Digits
5Cs: Cash, Car, Credit card, Condominium, Country club
A&G: Allen & Gledhill
A*STAR: Agency for Science, Technology And Research
AA: Asian Aerospace
ACJC: Anglo-Chinese Junior College
ACJS: Anglo-Chinese Junior School
ACM: Asian Civilisations Museum
ACPS: Anglo-Chinese Primary School
ACS: Anglo-Chinese School
ACSS: Anglo-Chinese Secondary School
AG: Attorney-General
AGC: Attorney-General's Chambers
AHS: Anglican High School
AJ: Gay
AJC: Anderson Junior College
AMK: Ang Mo Kio
AMP: Association of Muslim Professionals
APP: Assistant Public Prosecutor
APPLES: Application for Passport On-line Electronic System
AR: Assistant Registrar
AWARE: Association of Women for Action and Research
AYE: Ayer Rajah Expressway
BBDC: Bukit Batok Driving Centre
BGR: Boy-Girl Relationship
BKE: Bukit Timah Expressway
BMT: Basic Military Training
BMTC: Basic Military Training Centre
BPT: Basic Police Training
BRT: Basic Rescue Training
BTT: Basic Theory Test
CAAS: Civil Aviation Authority of Singapore
CAD: Combined Arms Division
CBD: Central Business District
CCA: Co-curricular activity
CCC: Chinese Chamber of Commerce
CCC: Citizen's Consultative Committee
CDAC: Chinese Development Assistance Council
CDC: Community Development Council
CEPAS: Contactless e-Purse Application System