The term 'Simple Connector' refers to a type of device used to join two or more electrical circuits together. It is typically used in low-voltage applications AND is designed to be easy to install AND maintain. The three-letter solution for this term is 'AND, ' which is an abbreviation for the logical operator 'AND.' This operator is used to connect two or more conditions in a logical statement, such as 'if A AND B are true, then C is true.' In this way, the term 'Simple Connector' can be thought of as a physical representation of the logical operator 'AND.'