The letter M emoji often shows up when texting quick replies or confirming plans—think “message received” or “meetup set.” It’s casual but can carry a hint of sass depending on context. Use it in a post-interview text to keep things brief, or as a Discord reaction when you want to acknowledge without overdoing it. Sometimes it’s just a minimalist way to say “okay” or “got it.” A simple M can speak volumes in the right conversation.