I expect 'ct' was never in an 8 bit coded character set standard and so didn't have to be included for compatibility and round-trip-mapping between the Unicode and such a standard. The other ligatures you mention are in one or another standard or code page.
- Chris "Kevin Brown" wrote > This has possibly been canvassed before, but I was wondering why there is > no character LATIN SMALL LIGATURE CT in Alphabetic Presentation Forms (or > elsewhere)? > The Alphabetic Presentation Forms range contains most of the other latin > ligatures such as st, ff, fi, fl etc. I would have thought that the ct > ligature was no more or less common than any of these. > Adobe Pro fonts (eg Minion, Caslon, Garamond etc) include the ct ligature > in the PUA. > What is the history of the non-inclusion of the ct ligature in the > Unicode Standard? > Kevin
