Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. Any of the complexvalued coordinates in twistor theory, which maps the geometric objects of conventional 3+1 spacetime into geometric objects in a fourdimensional space, twistor space, with metric signature (2,2), a proposed path to a theory of quantum gravity.
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Examples

But in twistor theory, a light ray is defined as a single point in lightray space, and a spacetime point P is represented by the celestial sphere's worth of light rays through P " in other words by a complex curve (a Riemann sphere) running through lightray space." link

But in twistor theory, a light ray is defined as a single point in lightray space, and a spacetime point P is represented by the celestial sphere's worth of light rays through P — in other words by a complex curve (a Riemann sphere) running through lightray space. link

Accordingly, the strings now become complex curves — Riemann surfaces, to be specific — in twistor space!

"… in twistor theory, a light ray is defined as a single point in lightray space, and a spacetime point P is represented by the celestial sphere's worth of light rays through P …"

A twistor is a pair of spinors well what's a spinor?
Einstein Still Rules, Says Fermi Telescope Team  Universe Today

Dr. David Harrison is a physicist who accidentally creates a device that swaps matter from our world into a parallel dimension using a 'twistor' effect.

Descriptions of Planck scale geometry include quantum gravity, spin networks, twistor theory and string theory.

In some respects this is a valid criticism of twistor theory also.

If we presume the twistorstring theory gains acceptence, it will result in something I pointed out multiple times.

The twistorstring theories of Witten [1] and Berkovits [2] combine topological string theory with the Penrose transform [3] to describe field theories in four dimensional spacetime.
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