If it is a repeated performance of a certain piece of music in a movement, it is called a repetition; if the entire work is played, but one of the movements is played again at the end, it is likely to be a reprise. Encore (encore), that is, after a wonderful concert, some works are performed to meet the needs of the audience. The situation you are talking about may be the latter. Another situation that may occur in records is that if a certain movement has a different version with different orchestration or score arrangement, some performers may perform the movement with different versions or orchestration again as an addendum, but this This is not often the case.

ps: I have listened to quite a few versions of Beethoven’s Fifth Symphony, but as you mentioned, I have never encountered the situation where you perform one of the movements again after finishing the work. However, I wonder who conducted the version you listened to? In addition, during encore performances, although there is a precedent of directly repeating a certain movement of the work that has just been performed, generally speaking, encores choose some small and lively works to perform to arouse the atmosphere, so I'm not sure that the situation you encountered is really an encore. .