Quickly add symbols to your documents

I’ve had this chart shown below for well over a dozen years. I’ve found it to be very useful for quickly adding a symbol to the document you are working on; particularly when working with emails describing things such as diameters and plus/minus dimension and angles. The trick is to simply hold down the Alt key on your keyboard and while you are holding it down, you simply type the 4 numbers corresponding to the symbol you want and then release the Alt key. So you can quickly type 0.251Ø or 30°±1°