What does the S mean in iPhone 6s?

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5. Why is my iPhone 6s battery draining so fast?
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Tags

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2. #though
3. #apparently
4. #still
5. #added
6. #features
7. #stands
8. #speculated
9. #security
10. #debated
11. #sensitivity
12. #iphone
13. #largely
14. #touch