53 known values for icon with current usage counts:

1. default (30685× used)
2. angel_wings (8524× used)
3. crown (6418× used)
4. joystick (6332× used)
5. moon (4114× used)
6. sakura (2265× used)
7. cat (1953× used)
8. dog (1692× used)
9. spider (1218× used)
10. pumpkin (724× used)
11. vampire (626× used)
12. headphones (551× used)
13. target (520× used)
14. sunglasses (512× used)
15. moustache (368× used)
16. coffee (305× used)
17. skill_issue (296× used)
18. panda (211× used)
19. snowflake (158× used)
20. santa (110× used)
21. pirate_flag (80× used)
22. wizard (75× used)
23. reindeer (74× used)
24. king (72× used)
25. octopus (62× used)
26. yeti (56× used)
27. lunar_dragon (51× used)
28. bad_bunny (48× used)
29. rocket (47× used)
30. wanted (45× used)
31. mountains (38× used)
32. koala (38× used)
33. bingo (36× used)
34. pyramid_eye (31× used)
35. bread (30× used)
36. ghost (30× used)
37. planet (28× used)
38. pirate (24× used)
39. cactus (23× used)
40. robot (20× used)
41. shark_attack (17× used)
42. cute_bunny (16× used)
43. watermelon (15× used)
44. eliminated (14× used)
45. fossil (13× used)
46. clover (8× used)
47. jailbreak (7× used)
48. ankh (5× used)
49. pine_tree (5× used)
50. bauble (2× used)
51. shooting_star (2× used)
52. palette (2× used)
53. eleven (1× used)