Before computers and screens (and digital imagery) there was lines per inch for printing, so there was possibly a print resolution of 72 lpi, but don't quote me on that. As you probably know, the standard print resolution is 300 dpi and the job I have explaining this to Design students isn't easy. Move on I have JD.
Sony PS-6750 • Goldring Eroica LX/Shure V15/III • Trichord Dino+ • Sony TA-FB940R/Audio Innovations Alto amps • Pioneer PD-S801 CDP • Nakamichi DR3 tape deck • Ruark Crusader II/JPW Sonata loudspeakers