Your browser probably has two toolbars, one as these shortcut icons is probably on either side to your URL bar. The icons to the left of you URL bar, you are mo

Your browser probably has two toolbars, one as these shortcut icons is probably on either side to your URL bar. The icons to the left of you URL bar, you are most likely deeply familiar with, so familiar in fact you know their functionality better than if they were worded out with “Back“, “Forward”, or “Reload” (this is 100x true if your browser is in a non-english language; even if that language is your native language). The buttons inside your URL bar are probably more complicated, you probably know what one or two do, maybe if they were replaced by text you could get better of a hint, but if you use them ones, you will probably know what they do afterwards just as well as if they were replaced by text. The icons on the right are probably some branded icons with unique functions that you have installed as plugins. You know what they do because of the brand, this would be equally true of text, and finally you have the hamburger (or the vertical ellipsis). At this point the hamburger (or the vertical ellipsis) has pretty well earned its place among the pause icon on your tape-deck (or, more likely, your VLC digital media player) as a universally recognizable icon. Now your second toolbar is probably hidden by some hover or keyboard action (in my browser it is reviled by a single press of my left alt key) it is all text and has numerous categories such as view, bookmarks, help, tools, etc. inside these categories there are functions such as copy, synced tabs, troubleshoot, etc. (mine is actually in Icelandic and many of those words I’m seeing for the first time and have no clue what they mean). If your app has only a few functions putting the correct icon next to the function label can help you navigate to your desired function more easily. If your app has a lot of functions (like your browser, or a document processor) all these icons will be an overkill, so you only design an icon for the most essential/most used functions (back, zoom in, boldface, undo, etc.). If loading a language model is an essential feature in your app, which is often performed, it may help users to have an icon next to the label (and sometimes even in place of the label if the label is complicated). Personally for “load language model” I probably would just use the upload icon (commonly an arrow pointing upwards from a bucket).