Díkǎérzuòbiāoxì
ㄉㄧˊ ㄎㄚˇ ㄦˊ ㄗㄨㄛˋ ㄅㄧㄠ ㄒㄧˋ
Simplified 笛卡儿坐标系
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 笛卡兒座標系 and it comes back until you know it.