To show what line icons are, here are two iPhone apps that use them: 
Line icons in iTunes Store and Phone app. As you can see from the apps above, line icons are good at reinforcing visual cues of key information without being obtrusive. If you’re looking for line icons, check out the 40 free icon sets below.
1. Line Icons
2. Streamline Icons
3. Line Icon Set for UI
4. Hicons
5. Simple Line Icons PSD
6. Thin Rounded Icons
7. Thinicons Free PSD
8. Other Icons
9. 25 Line Icons
10. Linecons Free
11. Free iOS 7 Icons
12. iOS 7-Inspired Line Icons
13. Icon Set (144)
14. Free Line-Style Icons
15. Settings Line Icons
16. Vectory Mini
17. Chapps Vector Icons
18. 45 Blue Drops
19. Budicon Tester
20. Ecommerce Line Icons
21. E-commerce Icons
22. Eco Ico
23. Thin Stroke Icons
24. Tab Bar Icons iOS 7
25. Free Skinny Icons
26. Dripicons
27. Nasty Icons
28. Tab Bar Icons iOS 7 Vol. 2
29. Tab Bar Icons iOS 7 Vol. 3
30. Tab Bar Icons iOS 7 Vol. 4
31. Simple Line Icons Set
32. Simple Line Icons Set Vol. 2
33. Simple Line Icons Set Vol. 3
34. Simple Line Icons Set Vol. 4
35. Cicons: 40 Outline Icons
36. 20 Thin Line Icons
37. Simplicons
38. Simple Icons
39. Free Line Icons for Web and UI Designs
40. Line Icons
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