for the full font, here: https://imgur.com/a/qbLoCns
I mean from my understanding h just describes multiple similarly produced sounds that never contrast in any language. In the case of arabic its a glottal fricative, in many languages its just a very strongly aspirated neutral vowel that assimilates to sorrounding vowels, or could work as a semivowel or aproximant or even somewhere between these. The point is even if the articulation is different, most speakers of most languages would categorize these as the same sound and there might even be a lot of allophony between them. Idk just my interpretation.