@ma_delsuc @mcSlibinas @calcifer
well, comp was a DOS command, but the joke is that COM[1-9] was the designator for the serial ports, and LPT[1-9] the one for parallel ports (the list of such reserved names also includes CON, AUX, PRN, NUL). They are basically the equivalent of the /dev/* stuff in Unix and similar systems, but they were first introduced in DOS when it didn't even have the concept of a directory so they're in the global namespace for files.