system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is W usually styled as a double-V and not a double-U?
gpt
V and U used to be the same letter and did not differentiate until *after* W was introduced. W originated as a "UU"/"VV" digraph in the 7th or 8th century, and U and V only became distinct letters in the 14th century.

Note that some languages do call it "double V" instead of "double U" (including: ~~German~~, Portuguese, Spanish, French, Icelandic, Czech, and Finnish).