perpendiculars
per-pen-dic-u-lars
noun
Lines or planes that form a 90-degree angle with another line or plane.
"Engineers checked the perpendiculars on the building plans."
Thesaurus
Synonyms: plumb line, upended, plumb, vertical, upright, unsloped, right, rectangular, orthogonal, normal, English-Gothic, perpendicular style
Antonyms: horizontal, inclined, oblique, parallel