"🤚👍" is a hand gesture commonly known as the "thumbs-up" sign. It signifies approval, agreement, or satisfaction. It can be used to express support, encouragement, or to indicate that something is good or well-received. The related term "MMano" seems to combine the word "mano," which means "hand" in Spanish, with the letter "M." However, without further context, it's unclear how "MMano" specifically relates to the thumbs-up gesture.