64 Types

64 is the atomic number of gadolinium, a lanthanide. It is also the maximum number of strokes in any Chinese character, the number of hexagrams in the I Ching, the number of sexual positions in the Kama Sutra, and the number of squares on a chessboard.

64 I-Ching Trigrams:
1. Persisting
2. Yielding
3. Sprouting
4. Enveloping
5. Attending
6. Arguing
7. Legions/Leading
8. Grouping
9. Accumulating Small
10. Treading
11. Pervading
12. Obstruction
13. Concording People
14. Great Possessing
15. Humbling
16. Providing For/Responding
17. Following
18. Corrupt/Renovating
19. Nearing
20. Viewing
21. Gnawing and Biting
22. Adorning
23. Stripping
24. Returning
25. Without Embroiling
26. Great Accumulating
27. Jaws/Swallowing
28. Great Exceeding
29. Repeating Gorge
30. Radiance
31. Conjoining
32. Persevering
33. Retiring
34. Great Invigorating
35. Prospering
36. Brightness Hiding
37. Dwelling People
38. Polarizing
39. Limping/Difficulties
40. Loosening/Deliverance
41. Diminishing
42. Augmenting
43. Resolution/Parting
44. Welcoming/Coupling
45. Clustering
46. Ascending
47. Confining/Oppression
48. The Well
49. Skinning/Revolution
50. The Vessel/Holding
51. Shake
52. Bound/Stabilizing
53. Infiltrating/Gradual Advance
54. Converting the Maiden
55. Abounding
56. Sojourning/Quest
57. Ground/Penetrating
58. Open/Expressing
59. Dispersing
60. Articulating
61. Center Accord
62. Small Exceeding
63. Already Fording
64. Not Yet Fording

Personality Typing Systems
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44 Types
64 Types
66 Types