Meaning
A large diamond shape in orange, standing on one point. It has no special meaning of its own, so it works mainly as a bold, warm bullet or highlight.
Event posts and announcements often use it to mark main sections, with 🔸 for the smaller points underneath: “🔶 Day 1: check-in and welcome dinner” It can also flag a medium-level alert in colour-coded lists. Its blue counterpart is 🔷.