A hash function is a mathematical process of taking a message (the input) of arbitrary length and turning it into a fixed length message digest (the output).
A financial instrument representing an operation of buying/selling of one currency for another.
Those currency pairs that do not include the US dollar in foreign exchange market trade are referred to as cross currency pairs or crosses.
Hardware wallets are a form of cryptocurrency cold storage. Resembling the appearance of a USB thumb drive, hardware wallets store your private keys offline from potential breaches. Not all cryptocurrencies are supported by hardware wallets.