line
one-dimensional infinite non-curved geometric object
Ley line
straight alignments between historic structures and landmarks
directrix
directrix of a conic section
Simson line
line defined from a triangle and a point on its circumcircle, through the closest point on each side line to the given point
heart line
geometry
axis of rotation
imaginary line around which a rotation occurs
radical axis
line determined by two circles
skew lines
lines in 3D that do not intersect and neither do they point the same direction
boundary
dividing line between two areas or sets of points in a topological space; difference between the closure and the interior
line at infinity
concept in geometry and topology
parallel line
lines which do not intersect
central line
line associated with a triangle centre
Euler line
straight line connecting multiple points that can be defined as the center of a triangle, such as the orthocenter, the circumcenter and the centroid
antiparallel line
line antiparallel to another one
intersecting line
lines which intersect
tangent
term in mathematics; straight line touching a point in a curve
asymptote
regarding a curve, a line such that the distance between the curve and the line approaches 0 as x→∞ or y→∞
real line
one-dimensional infinite real geometric object
secant line
line that intersects a curve at least twice
coordinate axis
spatial dimension according to which the position of an object can be judged