The fact that Doc from back to the future pronounces it "Jiggawatts" suggests he's only ever read it, and that he's entirely self-taught

@professor_stoke Alternative explanation - THIS is why he's so cautious about altering the timeline

@professor_stoke when dubbed in French (I was little and saw it in French...) he says "gigowatts", and I found it beautiful, a gigot being a lamb or pig leg, when used as food ;)

@professor_stoke Actually, Doc's pronounciation is also correct (but it wasn't correct in 1955!). From Wikipedia:

In English, the prefix giga can be pronounced /ˈɡɪɡə/ (a hard g as in giggle), or /ˈdʒɪɡə/ (a soft g as in giant, which shares giga's Greek root).[4]

This latter pronunciation was formalised within the United States in the 1960s and 1980s with the issue by the US National Bureau of Standards of pronunciation guides for the metric prefixes.[5]

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