Since the Etymology of pandoc is mixed, and the fact that $\forall$ is not really of any Etymological origin, I think the $\Delta$ is ok as long as it kind of convey the meaning. The $\forall \Delta$ thing gives me a picture of this: $\forall \delta_i, \delta_j \in \Delta, \text{pandoc}_{ij}: \delta_i \rightarrow \delta_j$

By the way, looking at the PDF, it seems it is not difficult to find one that both $\forall$ and $\Delta$ are at the same angle.

But then on 2nd thought, $\forall$ and $\Delta$ has very simple strokes, so make be using shape not type is better.

On Thursday, December 8, 2016 at 7:05:18 AM UTC-8, BP Jonsson wrote:

Den 2016-12-08 kl. 15:23, skrev Kolen Cheung:
> since both "letters" are of different languages, probably only math font has both

Not so. Attached are some examples of fonts on my system which
have both. You need to look at fonts which cater to linguist types.

I can't help pointing out, though, that the Greek word for
'document', ἔγγραπτος, doesn't start with a Δ, so perhaps a
ligature of Ɐ and a Latin D would be more appropriate.

/bpj