51 known values for icon with current usage counts:

1. default (28755× used)
2. angel_wings (8086× used)
3. crown (6158× used)
4. joystick (6100× used)
5. moon (3923× used)
6. sakura (2106× used)
7. cat (1819× used)
8. dog (1616× used)
9. spider (1214× used)
10. pumpkin (714× used)
11. vampire (614× used)
12. headphones (545× used)
13. sunglasses (513× used)
14. target (511× used)
15. moustache (363× used)
16. coffee (305× used)
17. skill_issue (250× used)
18. panda (215× used)
19. snowflake (162× used)
20. santa (109× used)
21. wizard (73× used)
22. pirate_flag (72× used)
23. reindeer (71× used)
24. king (68× used)
25. octopus (62× used)
26. yeti (52× used)
27. bad_bunny (51× used)
28. rocket (48× used)
29. lunar_dragon (46× used)
30. wanted (42× used)
31. koala (36× used)
32. ghost (30× used)
33. pyramid_eye (28× used)
34. planet (27× used)
35. mountains (25× used)
36. pirate (24× used)
37. bread (23× used)
38. cactus (18× used)
39. robot (17× used)
40. shark_attack (17× used)
41. cute_bunny (16× used)
42. watermelon (13× used)
43. fossil (12× used)
44. eliminated (10× used)
45. ankh (7× used)
46. pine_tree (6× used)
47. clover (5× used)
48. bingo (4× used)
49. shooting_star (2× used)
50. build_off (2× used)
51. eleven (1× used)