"Offset" would be ambiguous. An "offset-printed" banknote or postage stamp has had one or more printing stages misaligned, so I would imagine an "offset coin" to be off-centre, or a misaligned die.
"Upset" in used here in its original meaning of tipped over or tilted. As in the old phrase "He's upset the apple cart". The word only later took on a more figurative meaning of having one's usually cheerful disposition tipped over or tilted.
If it still bothers you, call it a "rotated die" instead.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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