It's just for convenience, I believe. Because when you are typing, each hand is close to the shift key.
shift 2 = @
The key combination [Shift]+2 should do for standard keyboards to type the "at" (@) sign.
Shift + 2 on some other keyboards than US you can try: right Alt + 2 right Alt + V
To type the "@ symbol," press and hold the Shift key on your keyboard and then press the number 2 key (usually located above the letter Q on most keyboards). This combination will produce the "@" symbol on your screen.
To type the hashtag symbol (#) on a QWERTY keyboard, press the "Shift" key and then the "3" key simultaneously. This combination will produce the hashtag character. On some keyboards, the layout may vary slightly, but the Shift + 3 method is standard for most English QWERTY keyboards.
Hold down the SHIFT key (immediately below Caps Lock key on most keyboards)
Just press the left SHIFT key and press the number 8 key
Not all keyboards are the same. On my keyboard < is "shift+," and > is "shift+.". < is just above the right hand end of the space bar and the > is to its right.
117,649. You can always do these arithmetic problems by typing them into Google. In the Google search bar, just type in 343 ^2 The ^ hat symbol is shift-6 on most keyboards and Google recognizes it as "to the power of".
Shift plus 8 produces the asterisk symbol (*), which is often used in mathematics to denote multiplication or as a wildcard character in programming and searches. On most keyboards, pressing the Shift key while pressing the number 8 key will yield this symbol.
USB and PS/2
there are so different keyboards in main stage 2 and 1 because if you choose one you can mode it how thou want and save it and this can became another keyboard that you can use.