Matrix = email. Element = Thunderbird, Outlook, etc. The Matrix name has never budged since the beginning of the project. One of the Matrix servers is called S

Matrix = email. Element = Thunderbird, Outlook, etc. The Matrix name has never budged since the beginning of the project. One of the Matrix servers is called Synapse. Others include Conduit or Dendrite (see https://matrix.org/ecosystem/servers/ https://matrix.org/ecosystem/servers/). So yes, Matrix is the protocol, not the/a server.