53 known values for icon with current usage counts:

1. default (30600× used)
2. angel_wings (8506× used)
3. crown (6406× used)
4. joystick (6317× used)
5. moon (4107× used)
6. sakura (2261× used)
7. cat (1951× used)
8. dog (1689× used)
9. spider (1219× used)
10. pumpkin (723× used)
11. vampire (625× used)
12. headphones (551× used)
13. target (518× used)
14. sunglasses (512× used)
15. moustache (368× used)
16. coffee (304× used)
17. skill_issue (296× used)
18. panda (211× used)
19. snowflake (158× used)
20. santa (110× used)
21. pirate_flag (79× used)
22. wizard (74× used)
23. reindeer (74× used)
24. king (71× 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 (43× used)
31. koala (38× used)
32. mountains (37× used)
33. bingo (33× used)
34. pyramid_eye (31× used)
35. bread (30× used)
36. ghost (30× used)
37. planet (28× used)
38. pirate (24× used)
39. cactus (21× used)
40. robot (21× used)
41. shark_attack (17× used)
42. cute_bunny (16× used)
43. watermelon (16× used)
44. eliminated (14× used)
45. fossil (13× used)
46. clover (8× used)
47. jailbreak (8× used)
48. ankh (5× used)
49. pine_tree (5× used)
50. palette (2× used)
51. bauble (2× used)
52. shooting_star (2× used)
53. eleven (1× used)