As far as I can tell, from the TrueType and OpenType specification docume\nts (found
here[
^]), there is no such property to tell you this. But, I didn't read the entire specification for either technology.
I can tell you there is no such property in the Font classes in .NET. So, if it's in the specification that this information should be supplied, you'd have to parse the font files yourself to get at it.