The name days originate in the list of holidays celebrated in commemoration of saints and martyrs of the church. For example, the name Karl or Carl is celebrated in Sweden on January 28, the anniversary of the death of Charlemagne (Charles magnus, i.e., 'the great').
The definition of an axis is a real or imaginary line on which something rotates, or a straight line around which things are evenly arranged. An example of axis is an imaginary line running through the earth on which the earth rotates. An example of axis is the line running through the body from head to feet determining left and right sides. axis.
The axis of symmetry or line of symmetry of a two-dimensional figure is a line such that, for each perpendicular constructed, if the perpendicular intersects the figure at a distance 'd' from the axis along the perpendicular, then there exists another intersection of the shape and the perpendicular, at the same distance 'd' from the axis, in the opposite direction along the perpendicular.