Buying, Storing, and Sending Crypto

What do you call the series of alphanumeric characters that is saved in a wallet file, is meant to be kept secret, and allows a user to access their cryptocurrency?
A business that provides customers with an online platform to buy and sell cryptocurrencies with each other is called a:
What is the name of the smallest unit of a bitcoin, which equals one hundred millionth of 1 whole bitcoin (0.00000001)?
A device or program that stores the public and/or private keys of a Bitcoin transaction is called a:
A company or an individual that charges a fee to facilitate purchases of cryptocurrencies at set prices,  is called a:
The regulations and procedures that customers are sometimes required to adhere to before using a Crypto related service are commonly referred to as:
What do you call the cryptographic code that allows a user to receive cryptocurrencies into their wallet?
A cryptocurrency wallet that stores your private keys in a secure physical device that is stored offline and therefore can't be hacked is called a:
What do you call the unique string of characters that is given to every transaction that is verified and added to the blockchain?
In addition to the transaction hash, every cryptocurrency transaction recorded to a blockchain contains 3 parts. The 1st is an input (a record of the address from which the sender received the coins). The 2nd is an output (the public key or address to which the coins will be sent). What is the 3rd part?