52 known values for icon with current usage counts:

1. default (29922× used)
2. angel_wings (8343× used)
3. crown (6312× used)
4. joystick (6248× used)
5. moon (4044× used)
6. sakura (2203× used)
7. cat (1916× used)
8. dog (1659× used)
9. spider (1214× used)
10. pumpkin (722× used)
11. vampire (625× used)
12. headphones (550× used)
13. target (514× used)
14. sunglasses (511× used)
15. moustache (365× used)
16. coffee (305× used)
17. skill_issue (274× used)
18. panda (213× used)
19. snowflake (159× used)
20. santa (110× used)
21. pirate_flag (78× used)
22. reindeer (75× used)
23. wizard (75× used)
24. king (70× used)
25. octopus (62× used)
26. yeti (52× used)
27. bad_bunny (48× used)
28. rocket (47× used)
29. wanted (45× used)
30. lunar_dragon (43× used)
31. koala (37× used)
32. mountains (32× used)
33. pyramid_eye (30× used)
34. ghost (30× used)
35. planet (29× used)
36. bread (27× used)
37. bingo (26× used)
38. pirate (24× used)
39. robot (19× used)
40. cactus (19× used)
41. shark_attack (17× used)
42. watermelon (16× used)
43. cute_bunny (16× used)
44. fossil (15× used)
45. eliminated (14× used)
46. clover (9× used)
47. jailbreak (7× used)
48. ankh (5× used)
49. pine_tree (5× used)
50. palette (3× used)
51. shooting_star (2× used)
52. eleven (1× used)