The assistant referee signals for a foul and, after the referee stops play, holds the flag across the lower body before moving toward the corner flag. what is the assistant referee indicating?

The assistant referee is indicating a penalty kick when the assistant ref signals for a foul, subsequently the referee proceeds to stop the play, then the flag is held across the lower body before moving towards the corner flag.

The penalty kick is system that restarts play in association football where a player is allowed to perform a single shot on to goal and the defendant is only the opposing team's goalkeeper.