Hello, I am trying to reproduce this standard ornament (which probably stands for a mordent or short trill, a Praller):
So I would need to find these double lines, which I can probably then insert via Shift-X
I can see this symbol in Sibelius (as praller), but where would I find it on Please wait while you are redirected ?
… for the moment I go the easy way and just use the tremolos…
Amazingly enough (sorry, but where else would it be?) it’s in the “tremolos” section! https://w3c.github.io/smufl/gitbook/tables/tremolos.html
Well, Rob, I think k_b was expecting something else, like thin lines (I admit I nerver crossed a praller in my career so far, so I have no idea about its looks, except for the little example posted here…) 
There were so many different signs used for ornaments in early music that this one seems to have escaped Daniel’s notice.
I suspect “Praller” is an abbreviation coined by a non-German speaker (but not necessarily by k_b!) These are not the “Pralltriller” ornament which is not included in J S Bach’s well known “table of ornaments” but is discussed at some length by C P E Bach, and which is (approximately!) an appoggiatura followed by a short trill.
In early English keyboard music it is generally considered to mean either a short or a long trill.
Single slanting lines also occur, but more rarely, and probably represent a “slide” of two rising notes before the main note.
The Bravura font doesn’t have a really good symbol for these IMO. You could also try a “grace note slash stem” https://w3c.github.io/smufl/gitbook/tables/common-ornaments.html or one of the “short oblique lines” from https://w3c.github.io/smufl/gitbook/tables/other-baroque-ornaments.html but none of them really work well.
These are also found in Purcell, but above the note, rather than through its stem.
I’m attaching here a screenshot showing the ornament itself, as well as a copy of a page explaining Purcell’s ornaments and how they are to be realized.
It would be fantastic if these ornaments were included in a future update! Perhaps there could be a new section of “Historical Ornaments” separate from the regular ornaments.
Some of those ornaments are a lot more complicated to add than others, as I expect you’re aware, Julian. Drawing oblique lines between the two noteheads of a dyad, for example, is certainly not something that can be added easily, and it would need to fight its way to the top of the priority list to stand a chance of being implemented – I’m afraid I don’t think that will happen in the near future.
being able to find them on the SMUFL page would be the first step (towards happiness .
I’ve added historical ornaments to scores by taking the score over to InDesign for final touch-up. It’s a clumsy process, but does produce good results. I can’t remember for sure, but I vaguely remember a custom ligature plug-in for InDesign that would allow you formulate some of these as ligatures or overprints if it’s something you need to do a lot.
All of you are clearly right — I understand why this would be a low priority, and it would be a helpful stopgap, at some point, to add them to SMUFL so we can copy and paste them in before they’re added to Dorico.
