Upper Right Block Diagonal Upper Middle Left To Lower Middle Right

A tile for drawing diagonals, not an emoji. The Unicode proposal files this exact shape in Teletext's G3 “smooth mosaics and line drawing” set: each character cell supplied one graphic piece, and neighbors, color and placement finished the picture. Alone in a message, 🭧 carries no mood to decode.

The shape grew out of teletext, not a design studio. The BBC's 1977 CEEFAX report dates the first teletext work to 1966; the service needed cheap maps, graphs and charts built from character cells. Engineers called it semigraphics — and, as of 2026, the craft lives on as teletext art.

The modern reading is technical, not symbolic. A teletext decoder picked 🭧 from a fixed G3 repertoire; in a Unicode string it stays a portable piece of that vocabulary. The 2020 encoding date marks when the shape joined the standard, not when it was invented.

Why does 🭧 show as a box?

Your font doesn't have it. Unicode assigns the identity; fonts supply the drawing. A hollow box means the renderer found nothing to show — not that the meaning changed. Even covering fonts draw the edges slightly differently, so match the diagonal's endpoints, not the pixels.