51 known values for icon with current usage counts:

1. default (29177× used)
2. angel_wings (8154× used)
3. crown (6201× used)
4. joystick (6139× used)
5. moon (3953× used)
6. sakura (2131× used)
7. cat (1836× used)
8. dog (1620× used)
9. spider (1210× used)
10. pumpkin (716× used)
11. vampire (620× used)
12. headphones (544× used)
13. target (512× used)
14. sunglasses (510× used)
15. moustache (365× used)
16. coffee (306× used)
17. skill_issue (258× used)
18. panda (214× used)
19. snowflake (161× used)
20. santa (109× used)
21. wizard (71× used)
22. reindeer (71× used)
23. pirate_flag (71× used)
24. king (70× used)
25. octopus (62× used)
26. yeti (52× used)
27. bad_bunny (50× used)
28. rocket (49× used)
29. lunar_dragon (47× used)
30. wanted (44× used)
31. koala (37× used)
32. ghost (32× used)
33. pyramid_eye (30× used)
34. planet (28× used)
35. pirate (24× used)
36. mountains (24× used)
37. bread (22× used)
38. robot (19× used)
39. shark_attack (16× used)
40. cute_bunny (16× used)
41. cactus (16× used)
42. bingo (13× used)
43. watermelon (13× used)
44. fossil (12× used)
45. eliminated (10× used)
46. clover (8× used)
47. ankh (6× used)
48. pine_tree (5× used)
49. shooting_star (2× used)
50. build_off (2× used)
51. eleven (1× used)