It turns out that these "blackboard letters" fall under the nemeth rule for bold typeface after all. We just didn't have that name for them. Mike -----Original Message----- From: liblouis-liblouisxml-bounce@xxxxxxxxxxxxx [mailto:liblouis-liblouisxml-bounce@xxxxxxxxxxxxx] On Behalf Of John Gardner Sent: Wednesday, June 25, 2008 1:34 PM To: liblouis-liblouisxml@xxxxxxxxxxxxx Subject: [liblouis-liblouisxml] Re: Bold Capital C Thanks to Susan for pointing out the use of these weird symbols. We sure don't want to develop notations for things that are used only on blackboards! I agree with John Boyer that these should just be bold letters. Presumably one could have double struck lower case letters being used to represent lower case bold letters as well as this instance where it is a capital letter. John G -----Original Message----- From: liblouis-liblouisxml-bounce@xxxxxxxxxxxxx [mailto:liblouis-liblouisxml-bounce@xxxxxxxxxxxxx] On Behalf Of John J. Boyer Sent: Wednesday, June 25, 2008 1:23 PM To: liblouis-liblouisxml@xxxxxxxxxxxxx Subject: [liblouis-liblouisxml] Bold Capital C Here is a private message from Susan Jolly which contains a link to an interesting article. In view of this, it would seem better to use the bold typeform for the double-struck capital C. If I remember right, this would be 456-6-14. Vectors should be represented by small bold letters, for example, 456-136 and 456-1236. John ----- Forwarded message from Susan Jolly <easjolly@xxxxxxxxxxxxx> ----- Subject: Double struck letters From: Susan Jolly <easjolly@xxxxxxxxxxxxx> Date: Wed, 25 Jun 2008 10:35:03 -0600 To: "'John J. Boyer'" <john.boyer@xxxxxxxxxxxxxxxx> Hi John, I thought you might find this article on the origin of double struck letters interesting. http://en.wikipedia.org/wiki/Blackboard_bold My inclination would be to use the Nemeth bold capital letters rather than the script capital letters to distinguish these symbols. Susan ----- End forwarded message ----- -- John J. boyer; President, Chief Software Developer JJB Software, Inc. http://www.jjb-software.com Madison, WI USA Developing software for people with disabilities For a description of the software and to download it go to http://www.jjb-software.com For a description of the software and to download it go to http://www.jjb-software.com For a description of the software and to download it go to http://www.jjb-software.com