Broadly speaking, it is unusual for tapered stuff to be specified in terms of angle. As most of this stuff was first produced on a lathe with two perpendicular axes of movement, it is much easier to specify tapers in terms of diameter reduction per unit length (in freedom units, inches per foot). Tapers expressed as angles have weird numerical values because the tangent of the taper angle is a 'nice' fractional value.
PG (DIN 40430) is an obsolete German thread used for electical conduit fittings. It has an 80 degree included angle. Metric conduit fittings are the standard now, generally 1.5mm pitch in whatever diameter, but adaptors are expensive and somewhat specialised. My reason for suggesting it is it opens the way to 3D print things using this thread, just as you have done with your NPT to metric adaptor.
BA is British Association thread, 47.5 degree included angle. Again, obsolete.
It is why I said if it does not cost much, it would be good to add them. For vee-thread profiles, 60 degree is by far the most common used today, followed by 55 degree, and 80 degree and 47.5 degree in a very distant tie for third place.
This site is very good: https://www.gewinde-normen.de/en/index.html