The term 'friendly opener' can be defined as a phrase or action used to start a conversation in a friendly manner. The two crossword solutions for this term are ECO and USER. ECO stands for 'environmental consciousness' and is an attitude of awareness and responsibility towards the environment. USER stands for 'unconditional support, encouragement, and respect' and is an attitude of acceptance and understanding towards others. Both ECO and USER are attitudes that can be used to start conversations in a friendly manner.