Notice that at the top of the article you linked it says: > This article is about decision trees in decision analysis. For the use of the term in machine learn

Notice that at the top of the article you linked it says: > This article is about decision trees in decision analysis. For the use of the term in machine learning, see Decision tree learning. That does not mean that there are no other definitions in addition to these two, for example the one used in game theory is here: https://en.wikipedia.org/wiki/Game_tree https://en.wikipedia.org/wiki/Game_tree > Any subtree that can be used to solve the game is known as a decision tree