This style of keyboard is called "40%" and, just as you would press shift+1 to input an exclamation mark, they're invariably set up with additional modifier key

This style of keyboard is called "40%" and, just as you would press shift+1 to input an exclamation mark, they're invariably set up with additional modifier keys (or chorded sequences) to input the values of all the missing keys. It's hard to say exactly how this one is configured, because it looks like a custom layout. The kit can be found here: https://5z6p.com/products/plaid-through-hole/ https://5z6p.com/products/plaid-through-hole/