Siamese twins (linguistics) conjoined twins from Siam. In the context of the English language, this word was first used and popularised by H. W. Fowler, a renowned lexicographer. The most common conjunctions used in a phrase that constitutes Siamese twins are "and" or "or." The structure of any Siamese twins phrase has words that are related in some way. The words constituting a Siamese twins phrase may be synonyms, antonyms, include alliterations or similar-sounding words that often rhyme. Other varieties of Siamese twins may also be possible. Examples below are split into various tables; some may belong in more than one table but
There are known knowns management and strategic planning circles. Known unknowns refers to "risks you are aware of, such as cancelled flights..." Unknown unknowns are risks that come from situations that are so unexpected that they would not be considered. "For example, prior to the invention of the personal computer, manufacturers of typewriters probably didn't foresee the risks to their business". Contemporary usage is largely consistent with the earliest known usages. For example, the term was used in evidence given to the British Columbia Royal Commission of Inquiry into Uranium Mining in 1979: The term also appeared in a 1982 "New Yorker" article on