It’s worth taking a closer look as it’s often there, but not where you expect to find it. The US layout, where the @ symbol shares the 2 key is the most popular place; sometimes its Shift + 2 but if that doesn’t work try Alt + Shift + 2 or Alt Gr + 2 (Alt Gr key is to the right of the spacebar). In France you will normally find it on the 0 key, whilst in the Czech Republic and Hungary it’s on V. On Austrian and German keyboards it’s on the Q key, and again you have to hold down the Alt Gr key to make it appear. Failing that there is a shortcut that works on virtually all Latin script keyboards and that’s Alt + 64; press the Numlock key first, and enter the digits on the numeric keypad.