True. Reality is they write them slightly differently, but this is the name that distinguishes them from Roman or Chinese numerals.
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4 ups, 4y
Should technically be called Umayyad numerals but then you'd have to explain what Umayyad means to people who are still going to be racist about it anyway.
So the language may differ from country to country. What's your point? IT IS THE MOST COMMON SYSTEM FOR THE SYMBOLIC REPRESENTATION OF NUMBERS IN THE WORLD TODAY.