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| | Abbreviation |
 | | Thus in the United Kingdom, titles such as "Doctor", "Mister" and "Mis'ess" are commonly abbreviated as "Dr", "Mr", and "Mrs" respectively, they are also frequently written, as in Canada and the U.S., as "Dr.", "Mr." and "Mrs." |
 | | Acronyms that were originally capitalized (with or without periods) but have since "stood the test of time" by entering the vocabulary as generic words are no longer abbreviated with capital letters nor with any periods—e.g., sonar, radar, ladar, laser, and scuba. |
 | | For the sake of convenience, many British publications, including the BBC and The Guardian, have completely done away with the use of full stops or periods in all abbreviations. |
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