The phenomenon where in people that are geographically separated experience a coincidence with no other possible explanation, that would not have happened otherwise.
You pick up the phone to dial your sister, and she is already on the line without dialing, or the phone ringing, as she has already called you.
But you know that if you did not go to call her, she would not have tried to call you - synchronicit causality
It was the act of picking up the phone that precipitated the event.