Final answer:
The ad setting that limits the number of times an ad can be shown to a particular user is called Frequency cap.
Step-by-step explanation:
The ad setting that limits the number of times an ad can be shown to a particular user is called Frequency cap. The frequency cap allows advertisers to control the number of times an ad is displayed to a user within a specific time period. For example, a frequency cap of 3 means that the ad will be shown to a user a maximum of 3 times.