Box drawings memo

Unicode box drawings. Single and double lines, rounded corners.

┌─┐ ╔═╗ ╒══╕ ╓─╖
│┼│ ║╬║ ╞╪╪╡ ║╫║
├┬┤ ╠╦╣ ╞╦╤╡ ╟╥╢
└┴┘ ╚╩╝ ╘╩╧╛ ╙╨╜
┌╌ ┏╍ ┌┄ ┏┅ ┌┈ ┌┉ ╭╮
╎  ╏  ┆  ┇  ┊  ┋    ╰╯