There are some abbreviations that we use very frequently, yet we may not know what words they exactly stand for!  Here are some

PIN:   Personal Identification Number

IQ:   Intelligence Quotient

CD:   Compact Disc

DVD:  Digital Video-Disc / Digital Versatile Disc

ISO:     Internatinal Organization for Standardization

ICU:    Intensive Care Unit

CCU:  Cardiac Care Unit

AIDS:   Acquired Immune Deficiency Syndrome

ISBN:   International Standard Book Number

OPEC: Organization of Petroleum Exporting Countries

IRNA:  Islamic  Republic News Agency

ISNA:  Iranian Student News Agency

TOEFL:  Test of English as a Foreign Language

IELTS:  International English Language Testing System

UNESCO:  United Nations Educational Scientific and Cultural Organization

UNICEF:  United Nations International Children's Emergency Fund

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