So how do Linux and Mac graphical terminal emulators manage to use monospaced true-type fonts? Granted, sometimes box drawing characters don't appear fully seam

So how do Linux and Mac graphical terminal emulators manage to use monospaced true-type fonts? Granted, sometimes box drawing characters don't appear fully seamless, and sometimes a character printed on console isn't in the chosen font, so the fallback font mechanism kicks in and the glyph is rendered with some non-monospaced font and looks ugly and out of place, but by and large, it seems that most terminal emulators manage to work just fine with true-type monospaced fonts.