Up/Down arrows in notification tray after unlocking

Question

Just recently, I have noticed an icon that has an arrow pointing up and an arrow pointing down appear for a split second after I unlock my phone. It goes away so fast I can't get a screenshot. What is this icon? What does it mean?



My phone is a Nexus 5x with Marshmallow 6.0.1.


— jonjon1123 | Sources

Answer

Turns out it was the app Signal Spy. It shows an up/down arrow while it is inspecting what your signal looks like.


— jonjon1123 | Sources

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