Are you questioning the name of the movie when you read the comments? The name of an American movie is straightforward, and if it is a metaphor, then it must have a meaning. Many people have heard of 21guns of Green day. At that time, I went to know about it and quoted it here: In Europe and the United States in the last century, when the two warring sides ceased fire, there would be three queues and one team, each with seven people, and one person fired three shots, so it was 21. The salute is right. To soothe the dead on the battlefield, it is an etiquette looking forward to peace. Now in many Western countries, it also symbolizes the highest and most respected etiquette instead of 21 guns. Similarly to the 21 bridges in this film, the significance of this 21 is obvious.
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