I have seen some writing where people have a list or a figure in writing and they will write something like this:
The information is provided in Image 3:-
Is that correct? Is this a British style?
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According to Nick Marten's The Secret History of Typography in the Oxford English Dictionary, a colon followed by a dash is a typographical mark that the OED refers to as the dog's bollocks:
Marten does not further elaborate on its purported usage, but others do:
Modern style guides seem intent on banishing its usage to history. For example, the University of Sussex has a strong opinion on the matter:
I'd love to find some examples in print, but as you can imagine:— it's extraordinarily difficult to google.
It's correct, because it is a recognised, well-known usage. However, it is redundant, and in most situations not the best or right usage. I would only use it where there is an established convention for its usage, such as in certain court documents.
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Looking around this page, colon + hyphen appears to be common to a number of Commonwealth and British territories, though there are exceptions to that rule (e.g. Phillipines).
Usage in legislation would seem to indicate that it is indeed "proper" to use punctuation in this way. The fact that its use is mainly (though not exclusively) in countries with a British connection suggests that it may be more a British style than a non-British one.
This is brilliant guys, thanks - I am a (UK) fiction novel writer and I use this piece of punctuation to indicate an attributive that finishes mid-sentence, with the actual quoted speech starting in the NEXT chapter.
Ours is a digital story/publishing concept that requires this odd way of formatting, and no other piece of punctuation is really up to the job as regards length of 'pause' and strength of intention as regards separating parts of a sentence that are important enough to warrant crossing chapters, so we brought it back, and liked the idea of recycling old punctuation for a modern publishing concept.
Having said that, it is generally considered archaic now, and looks too convoluted within a passage of text, and is, frankly, irritating to try and read past (IMHO) as it visually 'clogs things up' - especially in digital formats.
As well, I have just read a collection (endorsed by Salman Rushdie, no less) that contains wide usage of DASHED commas, DASHED colons and even DASHED fullstops. What grammarians often forget is punctuation is ALSO creative.
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