IPA: /ˌsɛmɪˈɒlədʒɪst/
KK: /sɛmiˈɑlədʒɪst/
A person who studies signs and symbols and how they are used in communication.
The semiologist analyzed the meaning behind the advertisements.
Semiologist → It is formed from "semi-" (from Greek "sēmeion", meaning sign) and "-logist" (from Greek "logistēs", meaning one who studies). A semiologist is someone who studies signs and symbols, particularly in the context of communication and meaning.
Think of someone who studies 'signs' ('semi-') and is an expert ('-logist') in understanding what those signs mean.