51 known values for icon with current usage counts:

1. default (28499× used)
2. angel_wings (8045× used)
3. crown (6117× used)
4. joystick (6078× used)
5. moon (3889× used)
6. sakura (2090× used)
7. cat (1811× used)
8. dog (1606× used)
9. spider (1207× used)
10. pumpkin (713× used)
11. vampire (613× used)
12. headphones (546× used)
13. sunglasses (513× used)
14. target (510× used)
15. moustache (363× used)
16. coffee (304× used)
17. skill_issue (246× used)
18. panda (214× used)
19. snowflake (160× used)
20. santa (109× used)
21. wizard (72× used)
22. pirate_flag (71× used)
23. reindeer (71× used)
24. king (67× used)
25. octopus (63× used)
26. bad_bunny (53× used)
27. yeti (52× used)
28. rocket (49× used)
29. lunar_dragon (46× used)
30. wanted (41× used)
31. koala (38× used)
32. ghost (31× used)
33. pyramid_eye (29× used)
34. planet (26× used)
35. mountains (24× used)
36. pirate (24× used)
37. bread (22× used)
38. cactus (18× used)
39. robot (18× used)
40. shark_attack (17× used)
41. cute_bunny (16× used)
42. fossil (12× used)
43. watermelon (12× used)
44. eliminated (9× used)
45. ankh (8× used)
46. pine_tree (7× used)
47. clover (5× used)
48. bingo (2× used)
49. shooting_star (2× used)
50. build_off (2× used)
51. eleven (1× used)