What does "SE" stand for in font name "Chalkboard SE"
Looking at the two Font in Font Book and seeing nothing other then Chalkboard SE has a Light version of the Font, where Chalkboard only has Regular and Bold versions, I decided to look at the two fonts in a Hex Editor. I noticed they were copyrighted six months apart:


Chalkboard, was copyrighted in 2003-04, by Apple Computer, Inc.
Chalkboard SE, was copyrighted in 2003-10, by Apple Computer, Inc.


I'd imagine that Chalkboard SE was created after Chalkboard as a second edition.

So, I'd say SE stands for Second Edition.

Update Note: Looking at the Get Info sheet, it shows the Copyright. I guess I should have looked there first.