51 known values for icon with current usage counts:

1. default (29417× used)
2. angel_wings (8203× used)
3. crown (6235× used)
4. joystick (6164× used)
5. moon (3970× used)
6. sakura (2140× used)
7. cat (1851× used)
8. dog (1630× used)
9. spider (1212× used)
10. pumpkin (717× used)
11. vampire (619× used)
12. headphones (546× used)
13. target (510× used)
14. sunglasses (510× used)
15. moustache (365× used)
16. coffee (305× used)
17. skill_issue (263× used)
18. panda (211× used)
19. snowflake (160× used)
20. santa (109× used)
21. pirate_flag (73× used)
22. reindeer (72× used)
23. king (71× used)
24. wizard (70× used)
25. octopus (62× used)
26. yeti (51× used)
27. bad_bunny (50× used)
28. lunar_dragon (48× used)
29. rocket (48× used)
30. wanted (44× used)
31. koala (38× used)
32. ghost (32× used)
33. planet (28× used)
34. pyramid_eye (28× used)
35. mountains (26× used)
36. bread (24× used)
37. pirate (24× used)
38. cactus (19× used)
39. bingo (18× used)
40. robot (17× used)
41. fossil (17× used)
42. shark_attack (16× used)
43. cute_bunny (15× used)
44. watermelon (14× used)
45. eliminated (12× used)
46. clover (10× used)
47. ankh (6× used)
48. pine_tree (6× used)
49. shooting_star (3× used)
50. build_off (2× used)
51. eleven (1× used)