Giubo :-).

(I have to look it up every time myself to remember iu or UI).

A giubo (/ˈdʒuːboʊ/ JOO-boh; etymology: giunto Boschi, "Boschi joint"), also known as a 'flexdisc', and sometimes* misspelled as guibo.

*I would suggest either often or usually vs. sometimes.

Also people usually try to pronounce in English and say gweeboh or similar. Once you know it's painful.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)