A colon is also used with ratios, titles and subtitles of books, city and publisher in bibliographies, business letter salutation, hours and minutes, and formal letters.
en.wikipedia.org The results may be satisfactory in simple domains such as horoscope machines or generators of personalised business letters.
en.wikipedia.org All told, the collection contained 3,000 items, including film stills, business letters and telegrams.
www.abc.net.au If this sounds like a lot of work, it was; when he died in 1410 he left 124,539 business letters and 573 account books and ledgers.
www.imt.ie According to his secretary, he opened some mail, and in the course of dictating a business letter became distracted.
en.wikipedia.org