Axial symmetry is symmetry around an axis; an object is axially symmetric if its appearance is unchanged if rotated around an axis. For example, a baseball bat or a tea saucer looks the same if it is rotated by any angle about the line passing lengthwise through its center, so it is axially symmetric.
See also 
- Rotational symmetry has a more general discussion
- Chiral symmetry describes the use in quantum mechanics
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