Yes, that shortcut shows ⌥, but there is an alternate Y symbol ⎇ in Character Viewer.

I don't think that either one matches the OP's original description. Character Viewer shows some font variations of both, so maybe it's a font issue.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P700, Photoshop CC, Lightroom CC, MS Office 365