What is a 3 letter word beginning with letters 'in'?

Some Words that end with 'IN' are:

1. again
2. akin
3. aspirin
4. assassin
5. attain
6. bargain
7. basin
8. begin
9. bin
10. bobbin
11. brain
12. chain
13. chin
14. din
15. drain
16. Einstein
17. elfin
18. explain
19. fin
20. fountain
21. gain
22. gin
23. goblin
24. grain
25. gremlin
26. grin
27. groin
28. hemoglobin
29. heroin
30. insulin
31. javelin
32. join
33. kin
34. Kremlin
35. lain
36. lanolin
37. lecithin
38. loin
39. main
40. mandolin
41. mannequin
42. margin
43. marlin
44. mountain
45. muffin
46. napkin
47. niacin
48. nitroglycerin
49. obtain
50. ordain
51. origin
52. pain
53. paraffin
54. pectin
55. penicillin
56. pertain
57. pin
58. plain
59. poplin
60. porcelain
61. protein
62. puffin
63. pumpkin
64. rain
65. raisin
66. regain
67. refrain
68. robin
69. rosin
70. satin
71. shin
72. sin
73. skein
74. skin
75. slain
76. Spain
77. spin
78. stain
79. stein
80. strain
81. tarpaulin
82. terrain
83. terrapin
84. thin
85. tin
86. toxin
87. train
88. twain
89. twin
90. urchin
91. vain
92. vein
93. vermin
94. violin
95. villain
96. virgin
97. vitamin
98. win
99. within
100. zeppelin