Ancient-enough greek includes examples of left-to-right, right-to-left, and alternating line orientation, and may be what you're thinking of. https://en.wikipe

Ancient-enough greek includes examples of left-to-right, right-to-left, and alternating line orientation, and may be what you're thinking of. https://en.wikipedia.org/wiki/Boustrophedon https://en.wikipedia.org/wiki/Boustrophedon