Letter to recall sent to return an ambassador from a country, either as a diplomatic protest or because the diplomat is being reassigned elsewhere and is being replaced by another envoy
Recollection, recall from memory. By analogy, many calculators have a "recall" button
Recall (information retrieval), a statistical measure (contrasted with precision), the fraction of (all) relevant material that is returned by the search
In dog training, recall is the process of bringing a dog to you from a distance
Recall (bugle call), a bugle call used to signify that an activity should end