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Sayyid (Arabic: سیّد, feminine: Sayyida(سیّدة), Arabic plural: Sada (سادة); noun: Siyada (سیادة)) is an Arabic honorific title denoting descendants of prophet Muhammad (s). According to fiqh, it is a title given to the descendants of Hashim b. Abd Manaf (the Prophet's great grandfather).
https://en.wikishia.net/view/Sayyid
Not sure is Saad is in the name of that poster means that he is a Sayyid
@shortstories
The word in the poster (Saad) is just an Arabic name it has nothing to do with the word (سيد sayyid )
Arabic is confusing I am sorry for that