Lower Two-Thirds Block

It fills the lower four cells of a six-cell block. “Sextant” means a grid of two columns and three rows; the numbers 3, 4, 5, and 6 mark the filled cells.

A Ceefax prototype around 1973 used block mosaics to outline a weather map. The UK Broadcast Teletext specification formalized a 2 × 3 alpha-mosaic set in 1976; these six-part cells let text pages draw maps, graphs, and charts. Designers later used the same coarse grid for headings, logos, and animated scenes.

Teletext kept spacing outside the character

On 1970s teletext pages, a display control could join the six cells edge-to-edge or leave narrow background gaps. Color and spacing belonged to separate controls; 🬹 carries only its filled-cell pattern. Adjacent tiles can build a coarse picture in aligned character cells.