What does "flag" mean?

根据文字冒险类游戏中flag决定剧情发展的特性，一般把接下来一定/很可能发生XX事情的做法称作XXflag。固定搭配包括 立flag：说了某些话或做了某些事达成了触发不好事件的条件 反flag（反式flag）：同上触发好事件 拔flag：将触发事件的条件去除

ENBased on the characteristic that flags in text adventure games determine the development of the plot, the practice of doing something that will definitely/very likely cause something to happen next is called an XX flag. Fixed collocations include Setting a flag: Saying or doing certain things to meet the conditions for triggering a bad event Anti-flag (reverse flag): Triggering a good event as above Removing a flag: Removing the conditions for triggering an event