As someone that has been learning new interfaces for the past 50-ish years as they randomly appear and mutate... I had no real idea what the icon might mean. Something that is stacked up that might drop down if I touch it? Could the lines mean a text document of some kind? Could it be a list of things? I got there eventually, but the word "menu" wouldn't have required any guessing on my part, for example. It was easier, though, than figuring out that the three vertical lines at the bottom of my android phone meant switch apps or that the rounded square meant "make the app go away, but don't kill it".