The golden ligatures collection. This collection of documents contains pairings of some ligatures with code points in the Unicode Private Use Area.
There is presently a policy of not adding any further ligature characters to regular Unicode. However, as there are some situations where a set of such ligature characters would be useful, here are some Private Use Area code points for ligatures, provided in the hope of being helpful to end users of the Unicode system who might like to have a list of code points for such ligatures. Medieval Unicode Font Initiative.
SIL's Private Use Area (PUA) TITUS. TUNE. ConScript Unicode Registry.