SA Designator and Component?

[FurkanDursun]

Hello Everyone,

I would like to ask something. I encountered an unknown component while I was designing the Pololu Altimu V5 IMU sensor. Does anyone know what is it? And How to work it? Why are they use it? This Chip's link is: https://www.pololu.com/product/2739

[robertferanec]

Looks like a pad which can be used if needed