x1 (text, image, page element) is infra/later-mentioned/subsequently mentioned/later/following/below/toward the bottom of the page/screen (flat and primarily two-dimensional display) relative to x2 (text, image, page element) on page/screen/in work x3 according to cultural convention x4.
x1 is the direction of vector x2 in Hilbert space (with basis/in coordinates, including defined scales and origins) x3; x1 is the direction of x2 in a Hilbert sense
x1 (text, image, page element) is supra/aforementioned/previous/earlier/preceding/above/toward the top of the page/screen (flat and primarily two-dimensional display) relative to x2 (text, image, page element) on page/screen/in work x3 according to cultural convention x4.
x1 (curling angular-direction) is a quantity expressed angularly with direction (counter)clockwise and
which maps to (pseudo)vector x2 (Cartesian direction) via rule/convention x3