Those vowel diacritics in Semitic languages are called matres lectionis.
https://en.wikipedia.org/wiki/Mater_lectionis
I thought he's talking about what in Arabic is called harakat https://en.wikipedia.org/wiki/Hebrew_diacritics https://en.wikipedia.org/wiki/Arabic_diacritics
I thought he's talking about what in Arabic is called harakat https://en.wikipedia.org/wiki/Hebrew_diacritics https://en.wikipedia.org/wiki/Arabic_diacritics