6379 is the number corresponding to MERZ on the phone button, and MERZ is taken from the name of Italian singer Alessia Merz. MERZ has long been used as a synonym for stupidity by Redis author antirez and his friends. Later, the Redis author chose this port when developing Redis.
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Alessia Merz is an Italian dancer and actress. Antirez, the author of Redis, watched TV shows in his early years and felt that some of Merz's words in the show were stupid and ridiculous. Antirez liked to make "memes" for daily communication with friends, so he coined the word "MERZ" to describe stupidity, which has the same meaning as "stupid" same.
Later Antirez redefined "MERZ", describing it as "having a high technical value, including skill, patience and labor, but still maintaining a simple essence."
When it came time to choose a number as the default port number for Redis, Antirez didn't think much and used the number 6379 corresponding to "MERZ" on the mobile phone keyboard.
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