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
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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