A ‣ Abbreviations pronounced as individual letters
Most abbreviations are pronounced as individual letters.
| Abbreviations for groups or organisations: |
| BBC | British Broadcasting Corporation |
| CIA | Central Intelligence Agency (US government agency collecting information about other countries) |
| EU | European Union |
| FBI | Federal Bureau of Investigation |
| MI6 | Military Intelligence 6(UK equivalent of CIA) |
| WHO | World Health Organisation |
| Other abbreviations pronounced as individual letters: |
| ID | Identity (an identity card or passport) |
| GM | genetically modified |
| DNA | deoxyribonucleic acid (chemical at centre of living cells) |
| FAQ | frequently asked questions |
| AKA | also known as |
| IOU | I owe you |
| ATM | automated teller machine (cash machine usually outside bank) |
| ASAP | as soon as possible |
Language help
When these abbreviations are stressed words in the sentence, the stress falls on the last letter, e.g. She works for the CIA. I heard it on the BBC.
B ‣ Abbreviations pronounced as words 
Abbreviations pronounced as individual words are called acronyms.
| NATO /neɪtiəʊ/ | North Atlantic Treaty Organisation |
| PIN /pɪn/ | Personal Identity Number (e.g. for a bank or credit card) |
| SAD | seasonal affective disorder (lacking energy and enthusiasm in winter in latitudes where there is little sunlight at that time) |
| AWOL /eɪwɒl/ | absent without leave [permission; usually used in military contexts] |
Some acronyms have become so normal as words that people do not think of them as abbreviations any longer, and so they are not written in capital letters.
C ‣ Clippings 
Some words are often used in an abbreviated form in informal situations. We say, for example, kilo instead of ‘kilogram’ or gig for ‘gigabyte’. Other examples include:
- air con (air conditioning)
- satnav (satellite navigation system)
- uni (university)
- mobile (mobile phone) or (US) cell (cellphone)
- carbs (carbohydrates)
- sci-fi (science fiction)
- high-tech (high-technology)
D ‣ Written abbreviations 
Some abbreviations are most frequently used in writing.
| PTO | Please turn over (turn to the next page) |
| PS | post script (written at the end of a message or letter, when you want to add something else) |
| RSVP | Répondezs’il vous plaît (French, meaning ‘please answer’)(written at the end of an invitation, to indicate that you should reply) |
| RIP | Rest in peace (often written on a headstone where someone is buried after they have died) |