UTF-8
Concept
variable-width encoding (into one to four bytes) and transformation format of code points for the universal character set defined by ISO/IEC 10646 and The Unicode® Standard, compatible with ASCII
Mentioned in 2 videos
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Videos Mentioning UTF-8

100 Firebase Tips, Tricks, and Screw-ups
Fireship
A character encoding standard that allows emojis to be used and queried within Firestore documents as regular strings.

Advanced Topics in Programming Languages: Concurrency/message passing Newsqueak
GoogleTalksArchive
Character encoding standard developed by Rob Pike and others.