Upper and Lower Triangular Half Block

It is a screen-graphics tile, not an emoji.

The Unicode source table maps it to MSX character code D1. The MSX home-computer standard was announced in Japan in 1983.

A character cell is one slot in a row of text. On MSX, graphic characters could be joined into low-resolution pictures; Unicode preserves them as text characters for compatibility with old computer material.

Can I use 🮚 in text art?

Yes—place it beside other graphic cells to build a larger pattern.

Choose a fixed-width font, where every character has the same width. In a proportional font, this tile can fall out of line with its neighbors.