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xkcd #3232: Countdown Standard
(imgs.xkcd.com)
xkcd #3232: Countdown Standard
Title text:
Anyone who is caught counting 'three ... two ... one ... zero ... GO!' will be punished with a lifetime of eating only ISO standard food samples.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3232/
Fortnightly already exists as a term though, why would biweekly mean the same thing?
We can have more than one way of describing things. Sometimes there is subtle nuances between the words.
No one ever uses fortnightly though. I have a hard time even remembering what it means as it's never used.