The Miami Heat are known for their never say die attitude. Whether you look at a large sample or a small one, the case is the same.
In example of a small sample, the Miami Heat are never out of a game. No matter how far they may find themselves down at any point, the team you can always count on to keep fighting, often making a comeback push, are the Miami Heat.
When talking about a season, in a large sample size, they are the type of organization to come back with a vengeance after adversity. Littered with examples throughout their history, one such example could be last season after the sideline dustup heard around the world.
In order to have or maintain that mentality though, they must roster like-minded players of the same philosophy and principles. That is the Miami Heat Culture.