After it rotates 90 degrees (one quarter turn), it looks the same as before. It is this transformation of an object so that the result is indistinguishable from the original that defines a symmetry.

If symmetry is a sign of splendor, then the newly discovered Red Square nebula is one of the most beautiful objects in the universe. Seen in the infrared, the nebula resembles a giant, glowing red ...

However, symmetry photography doesn't have to be limited to capturing exact reflections; symmetrical elements can form part of the composition in more subtle ways.

ADVISORY, Dec. 22, 2014 (GLOBE NEWSWIRE) -- What: Symmetry Surgical Inc. (Nasdaq:SSRG), will visit the Nasdaq MarketSite in Times Square. Symmetry Surgical is dedicated to developing high-quality ...

A newly discovered nebula, called the ‘Red Square’, displays a dazzling, gem-like symmetry, new observations reveal. But the nature of the star or stars that produced it remains a mystery ...

The LSCO crystal lattice also has square symmetry, with two equal periodicities, or arrangements of atoms, in the vertical and horizontal directions.

The strontium ruthenate crystal has fourfold rotational symmetry like a square, meaning that it looks identical when turned by 90 degrees (four times to equal a complete 360-degree rotation).

Madison Square Garden has played host to historic moments during Mike Krzyzewski's career. On Tuesday, he'll return for the final time.

Watch the video below from BBC Bitesize KS2 Maths which shows the lines of symmetry on a square, triangle, rectangle and circle.