&dAInv. 11, BWV 782, r.h.&d@  

K = COMPOUND SLIDE-TRILL-MORDENT, m. 10: The first "Doppelt-Cadence" 
of the "Explication", a slide-trill (see Inv. 9, BWV 780, r.h., m. 
16) completed by a mordent. A downward hook is at the start of a
long-trill symbol, and at the end is a mordent slash.