52 known values for icon with current usage counts:

1. default (27918× used)
2. angel_wings (7990× used)
3. crown (6068× used)
4. joystick (6045× used)
5. moon (3873× used)
6. sakura (2072× used)
7. cat (1796× used)
8. dog (1594× used)
9. spider (1204× used)
10. pumpkin (714× used)
11. vampire (614× used)
12. headphones (543× used)
13. sunglasses (513× used)
14. target (511× used)
15. moustache (363× used)
16. coffee (304× used)
17. skill_issue (236× used)
18. panda (212× used)
19. snowflake (163× used)
20. santa (109× used)
21. wizard (72× used)
22. reindeer (71× used)
23. pirate_flag (70× used)
24. king (68× used)
25. octopus (64× used)
26. bad_bunny (54× used)
27. yeti (53× used)
28. rocket (48× used)
29. lunar_dragon (41× used)
30. koala (39× used)
31. wanted (38× used)
32. ghost (31× used)
33. pyramid_eye (29× used)
34. planet (25× used)
35. pirate (23× used)
36. bread (21× used)
37. mountains (21× used)
38. shark_attack (18× used)
39. cactus (16× used)
40. robot (16× used)
41. cute_bunny (15× used)
42. eliminated (13× used)
43. fossil (12× used)
44. watermelon (11× used)
45. ankh (8× used)
46. clover (5× used)
47. pine_tree (5× used)
48. bingo (2× used)
49. shooting_star (2× used)
50. build_off (2× used)
51. jailbreak (1× used)
52. eleven (1× used)