Box Drawings Up Single and Right Double

Box Drawings Up Single and Right Double at U+2558 is a line-drawing character that joins a single vertical stroke above to a double horizontal stroke extending to the right. It sits in the Box Drawing block, a set made for constructing text-mode borders, tables, and interface frames from fixed-width characters. Its main use is in terminal and console layouts where plain text must show structure without graphics. This character forms a mixed-weight lower-left corner or junction: for example, a single-line left border can turn into a double-line bottom rule running rightward in a text table, menu frame, or status panel. It also appears in legacy DOS code pages, bulletin board systems, roguelike game interfaces, and documentation that reproduces old text user interfaces. The important practical detail is alignment: it only looks correct in a monospaced environment, and it needs neighboring box-drawing characters of matching single and double weight to make the corner read as intended.