52 known values for icon with current usage counts:

1. default (29637× used)
2. angel_wings (8238× used)
3. crown (6262× used)
4. joystick (6202× used)
5. moon (4002× used)
6. sakura (2157× used)
7. cat (1875× used)
8. dog (1650× used)
9. spider (1211× used)
10. pumpkin (719× used)
11. vampire (621× used)
12. headphones (547× used)
13. target (514× used)
14. sunglasses (509× used)
15. moustache (365× used)
16. coffee (307× used)
17. skill_issue (266× used)
18. panda (211× used)
19. snowflake (159× used)
20. santa (109× used)
21. pirate_flag (77× used)
22. reindeer (71× used)
23. wizard (70× used)
24. king (69× used)
25. octopus (62× used)
26. yeti (52× used)
27. rocket (50× used)
28. bad_bunny (49× used)
29. wanted (45× used)
30. lunar_dragon (44× used)
31. koala (36× used)
32. ghost (32× used)
33. mountains (31× used)
34. pyramid_eye (29× used)
35. planet (29× used)
36. bingo (25× used)
37. bread (24× used)
38. pirate (24× used)
39. robot (18× used)
40. cactus (18× used)
41. shark_attack (16× used)
42. watermelon (16× used)
43. cute_bunny (15× used)
44. fossil (15× used)
45. eliminated (14× used)
46. clover (8× used)
47. pine_tree (6× used)
48. ankh (5× used)
49. jailbreak (4× used)
50. build_off (2× used)
51. shooting_star (2× used)
52. eleven (1× used)