Alt+0186 = º
Alt+0185 = ¹
Alt+0178 = ²
Alt+0179 = ³
And so on ⁴⁵⁶⁷⁸⁹
Or ₀₁₂₃₄₅₆₇₈₉ (compare 0123456789)
You can combine them (ok, not really): ⅛ ⅙ ⅕ ¼ ⅓ ⅜ ⅖ ½ ⅗ ⅝ ⅔ ¾ ⅘ ⅚ ⅞
And did you know you've got %, ‰ and ‱...
What else? *, ⁎, ⁑ and ⁂...

Well, ♫ that's all folks ♪ (for now). ⚠