👉 The term "unkeyed" in information theory refers to a signal that is not encoded or processed using a specific encoding scheme. It can be thought of as an unencoded signal, meaning it does not carry any meaningful information about the original data being transmitted. Unencoded signals are often used in communication systems where the sender wants to transmit without having to encode the data into a binary format before transmitting it over a channel such as radio or fiber optic cables. This is because encoding and decoding can be