54 known values for icon with current usage counts:

1. default (31642× used)
2. angel_wings (8728× used)
3. crown (6543× used)
4. joystick (6427× used)
5. moon (4206× used)
6. sakura (2374× used)
7. cat (2017× used)
8. dog (1724× used)
9. spider (1221× used)
10. pumpkin (726× used)
11. vampire (625× used)
12. headphones (556× used)
13. target (520× used)
14. sunglasses (515× used)
15. moustache (368× used)
16. skill_issue (308× used)
17. coffee (302× used)
18. panda (209× used)
19. snowflake (160× used)
20. santa (109× used)
21. pirate_flag (78× used)
22. wizard (75× used)
23. reindeer (73× used)
24. king (73× used)
25. octopus (63× used)
26. yeti (57× used)
27. rocket (53× used)
28. wanted (51× used)
29. lunar_dragon (50× used)
30. bad_bunny (49× used)
31. mountains (43× used)
32. koala (41× used)
33. bingo (35× used)
34. pyramid_eye (33× used)
35. planet (31× used)
36. bread (31× used)
37. ghost (30× used)
38. cactus (27× used)
39. robot (26× used)
40. pirate (24× used)
41. watermelon (17× used)
42. eliminated (16× used)
43. shark_attack (16× used)
44. cute_bunny (16× used)
45. jailbreak (15× used)
46. fossil (13× used)
47. clover (9× used)
48. ankh (5× used)
49. pine_tree (5× used)
50. bauble (3× used)
51. random (2× used)
52. shooting_star (2× used)
53. palette (2× used)
54. eleven (1× used)