strapline

noun

1. A secondary heading or headline, especially one printed above another.
2. (British)A memorable slogan attached to a commercial brand.

   “On Tuesday, Buzzfeed published a long piece by Reggie Ugwu, looking at how a variant of instrumental electronic music had become the favoured soundtrack of the “alt-right”, the US-based far-right movement. Within hours, a website whose strapline declares it is “destroying Jewish tyranny” had picked up on the piece.”