Timey-wimey distress beacon
From Tardis Wiki, the free Doctor Who reference
The Timey-Wimey Distress Beacon was built by River Song on the top of the Great Pyramid of Giza in a time line where everything happened at the same moment, The time line came into being because she refused to kill the Doctor. She used the beacon to senda message to all space and time asking for help on behalf of the Doctor. (DW: The Wedding of River Song)
