You can add special symbols to html with a decimal or hexidecimal reference. A quick google search of “how to display ‘x’ symbol in html” will usually give you a list of the symbols and their hexidecimal references.
One option that might help if you really can’t see it on the keyboard is using the On-Screen keyboard. If you search for “keyboard” in the start menu you should see it. The layout it uses tries to mimic your keyboard layout (with some limitations). See if you can find it on the visual display. Also, when pressing any of the modifier keys like Shift or Alt it will highlight the keys that it is switching to.