tūduōbiānxíng
ㄊㄨ ㄉㄨㄛ ㄅㄧㄢ ㄒㄧㄥˊ
Simplified 凸多边形
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 凸多邊形 and it comes back until you know it.