Unicode has lots:
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2022 • BULLET 2219 ∙ BULLET OPERATOR 2E33 ⸳ RAISED DOT 25CF ● BLACK CIRCLE 26AB ⚫ MEDIUM BLACK CIRCLE 2B24 ⬤ BLACK LARGE CIRCLE 1F784 🞄 BLACK SLIGHTLY SMALL CIRCLE
ISTR Motif having a spinner widget, but you could use the U+26AA/U+26AB pair (/). There are also some very silly ideas at https://github.com/swelljoe/spinner
Just something small that will display on and off showing the "heartbeat" of the program. A spinner would be nice but the ttf font would be a cinch.
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