1. Before the mid 18th century, double dots were not used. 2. The Syriac question mark has the form of a vertical double dot . 3. So now we sometimes have double dots ( so to speak ). 4. Until then, in some circumstances, single dots could mean double dots . 5. A double dot or some other variation marks the 12th fret and 24th frets. 6. Unicode includes all of ISO-8859 and also provides the double dot as. 7. The double dot at the twelfth fret shows where to produce an octave of the open string. 8. Mainly for compatibility with older character encodings, dozens of codepoints with letters with double dots are available. 9. Using Mac OS or OS X, a letter with double dots can be produced by pressing, then the letter. 10. There are two ways to define the double dot product, one must be careful when deciding which convention to use.
