51 known values for icon with current usage counts:

1. default (29311× used)
2. angel_wings (8179× used)
3. crown (6218× used)
4. joystick (6149× used)
5. moon (3965× used)
6. sakura (2137× used)
7. cat (1843× used)
8. dog (1625× used)
9. spider (1212× used)
10. pumpkin (716× used)
11. vampire (620× used)
12. headphones (545× used)
13. target (511× used)
14. sunglasses (509× used)
15. moustache (365× used)
16. coffee (306× used)
17. skill_issue (262× used)
18. panda (212× used)
19. snowflake (160× used)
20. santa (109× used)
21. pirate_flag (75× used)
22. reindeer (71× used)
23. wizard (71× used)
24. king (69× used)
25. octopus (62× used)
26. yeti (52× used)
27. bad_bunny (50× used)
28. rocket (48× used)
29. lunar_dragon (47× used)
30. wanted (44× used)
31. koala (37× used)
32. ghost (31× used)
33. pyramid_eye (30× used)
34. planet (28× used)
35. pirate (24× used)
36. mountains (24× used)
37. bread (23× used)
38. cactus (17× used)
39. robot (16× used)
40. bingo (16× used)
41. shark_attack (16× used)
42. cute_bunny (15× used)
43. watermelon (14× used)
44. fossil (12× used)
45. eliminated (11× used)
46. clover (9× used)
47. ankh (6× used)
48. pine_tree (5× used)
49. shooting_star (2× used)
50. build_off (2× used)
51. eleven (1× used)