It has a raised ridge down the central axis of symmetry.
The most important symbols are placed along the axis of symmetry.
This is the plane which includes both the object point being considered and the axis of symmetry.
Those things have no axis of symmetry at all.
Consider a charged body rotating about an axis of symmetry.
The symmetry axis is usually associated with regional stress or gravity.
The secondary winding is shown as a brown line coming directly down the axis of symmetry.
A circle has infinitely many axes of symmetry, for the same reason.
The axis of symmetry is the line which passes through both the focus and the vertex.
You only have to look at the diffraction pattern shown to see a nice 10-fold symmetry axis.
Wörterbuch für Mathematik