A ‣ Abbreviations pronounced as individual letters 
| e.g. | for example, from exempli gratia (Latin) |
| i.e. | that is, from id est (Latin) |
| AD | the year of our Lord, from Anno Domini (Latin), used in the Christian calendar to count years since the birth of Christ; many people prefer CE as an alternative [Common Era] |
| BC | before Christ, used to count the years before the birth of Christ; many people prefer BCE [before the Common Era] |
| EU | European Union |
| ID | identity document |
| NB | note well, from nota bene (Latin), used as a warning or to point out something important |
| IQ | intelligence quotient: a way of measuring people’s intelligence using a system of numbers |
| PTO | please turn over |
| USB | Universal Serial Bus: a type of connection between a computer and an electronic device |
| FAQ | frequently asked questions |
| ASAP | as soon as possible |
| VIP | very important person |
| RSVP | please reply (used on invitations, from French, répondez s’il vous plaît) |
| UFO | /juːefˈəʊ/ unidentified flying object; often used to talk about an alien spaceship |
B ‣ Shortened and blended words 
| bedsit | a flat with only one room which is a bedroom and a sitting room |
| sitcom | short for situational comedy: a kind of humorous TV programme |
| sci-fi | /ˈsaɪfaɪ/ science fiction |
| info | information |
| biodata | /ˈbaɪəʊ deɪtə/ biographical data: details about someone’s life, job and achievements |
| biopic | /ˈbaɪəʊpɪk/ biographical picture: a film about the life of a real person |
| wi-fi | /ˈwaɪfaɪ/ wireless fidelity: wireless connection for computers and electronic communications |
C ‣ Acronyms 
Some abbreviations are acronyms, i.e. they are formed from the first letters (or occasionally syllables) of a word or series of words and are pronounced as a word.
| AIDS | /eɪdz/ acquired immune deficiency syndrome |
| NATO | /ˈneɪtəʊ/ North Atlantic Treaty Organisation |
| PIN | personal identification number (used on credit cards, bank cards, etc.) |
| VAT | value-added tax (a kind of tax on goods), pronounced /væt/ or /ˌviːeɪˈtiː/ |
D ‣ Abbreviations used in academic writing and bibliographies 
| fig. | figure (a picture or drawing, often with a number, in a book or other document). Example: See fig. 2. |
| ed. (plural eds.) | editor/editors (often used in bibliographical references) |
| p. (plural pp.) | page/pages. Examples: see p. 26, see pp. 58–61 (from page 58 to page 61). |
| cf. | compare. Example: Carter (1997) investigated core vocabulary (cf. Lee 1987). |
| et al. | and others (used in bibliographical references to refer to a book or article with several authors, usually three or more). Example: O’Keeffe et al. (2010) discuss this problem. |