52 known values for icon with current usage counts:

1. default (29706× used)
2. angel_wings (8265× used)
3. crown (6280× used)
4. joystick (6209× used)
5. moon (4017× used)
6. sakura (2169× used)
7. cat (1892× used)
8. dog (1652× used)
9. spider (1211× used)
10. pumpkin (720× used)
11. vampire (624× used)
12. headphones (547× used)
13. target (515× used)
14. sunglasses (509× used)
15. moustache (365× used)
16. coffee (309× used)
17. skill_issue (267× used)
18. panda (211× used)
19. snowflake (159× used)
20. santa (109× used)
21. pirate_flag (76× used)
22. wizard (74× used)
23. reindeer (71× used)
24. king (68× used)
25. octopus (62× used)
26. yeti (51× used)
27. rocket (50× used)
28. bad_bunny (49× used)
29. wanted (45× used)
30. lunar_dragon (43× used)
31. koala (36× used)
32. mountains (33× used)
33. ghost (30× used)
34. pyramid_eye (29× used)
35. planet (29× used)
36. bingo (27× used)
37. bread (25× used)
38. pirate (24× used)
39. robot (18× used)
40. cactus (17× used)
41. shark_attack (16× used)
42. fossil (16× used)
43. watermelon (16× used)
44. cute_bunny (15× used)
45. eliminated (12× used)
46. clover (9× used)
47. ankh (5× used)
48. pine_tree (5× used)
49. jailbreak (3× used)
50. shooting_star (2× used)
51. palette (2× used)
52. eleven (1× used)