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Akshually, hieroglyphic writing have components that allow you to determine the pronunciation of symbols.
Emojis do not (unless they are tagged with meanings in the metadata to allow for searching, but these are typically not visible). They are more like Chinese characters in which the meaning is encoded but pronunciation is not.
Akshually, you can often know the pronunciation of a Chinese character from one of it's radicals. I don't know how many characters this is the case for for Chinese (and how it varies between different spoken Chinese languages), but for Japanese it's like 80% of them.
https://en.wikipedia.org/wiki/Chinese_characters#Phonographs
(=ㅇᆽㅇ=)
The emojis used in my display name can be pronounced. 😌