In English, we read from left-to-right, top-to-bottom.
In traditional Japanese, text is read up-todown, right-to-left.
Is there an English word that describes the "reading strategy" of a particular culture or language? Printers can be configured with "page orientation" for either "Portrait" or "Landscape", so perhaps something like "reading orientation"?
tl;dr
The accepted answer, plus Java's concept of text directionality inspires me to believe directionality is the most appropriate word here.