Well, I found one both in Zapfino and Bickham Script Pro, but none in non-script fonts, not even in the pro-est pro ones.

Are you sure that person said ‘r-t-ligature’, and not ‘arty ligature’? ;°)

I included a back-ligaturing "t" in Oneleigh, which can be used to make the usual quaints, as well as others such as r-t.

That's a neat trick Nick. (or should I say MR. Shinn?).

Nick Cooke

I am guessing that a heavilly tracked sans had it's r & t collide producing a faux ligature. Some sans fonts are more prone to this than others. Looking at it a little it seems like the older the sans the more likely this is although I haven't looked in enough detail to make the claim stand.

Here is an example of what I mean.

Thank you all for your opinion, but you've proven what I was thinking, so far, only the aestetics of a script or a serifed old style typefaces would justify that sort of ligature... :(
That's a fine design, Nick, got to take a look a it!
Funny response Florian, but considering that I'm Portuguese, that kind of missunderstanding can´t be applied ;)
Eben, that's a nice perspective, but the tracking is supposed to be zero. Besides, that kind of tracking starts to damage reading, especially for sans typefaces don´t you think?
Thanks anyway :)

Besides, that kind of tracking starts to damage reading, especially for sans typefaces don´t you think?

I do, but it happens all the time, and I can see how a novice might notice it & have questions...

I just noticed the rt ligature being used on a pack of Newport 100s and had to look it up to see if it was a thing. Interesting, at least.