In defense of Frederick Neumann, who surely knows as much about ornamentation as anyone on the planet: he calls the squiggle with a line through it a “mordent”, just like J. S. Bach, generations of musicians before and after him, and every reference work I own including the 1954 Groves Dictionary. The word is derived from the Italian word meaning “to bite”, which exactly describes the sound of this very fast alternation between the main tone and its lower, often chromatic, auxiliary tone.
Without a line, a short squiggle is called a “trill”, a “schneller”, or a “pralltriller”. It has also been termed an “inverted mordent”, a somewhat misleading term that one hopes will become obsolete soon, since the effect of a trill is generally different from that of a mordent.
If Dorico does not use these common musical terms property, it has again redefined standard terms as it wishes, as with the term “voice” which can be a “chord”, of all things. I find this not only unacceptable but absurd.
If I misunderstand and Dorico is using these terms correctly, thank goodness!