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- In metric systems of units, multiplying the unit to which it is attached by 1027; octillion-. Symbol: X
- 1994, IPC Magazines, New Scientist Vol. 144, page 81:
- The SI prefixes above are not the only extreme ones. Others such as xenno (x) (10-27) and xenna (X) (1027), or vendeko (v) (10-33) and vendeka (V) (1033) exist, and can help simplify the expression of extreme numbers.
- 1997, Council of Scientific & Industrial Research, Science Reporter Vol. 34, page 22:
- Some of the terms which are in use are Zetta (1021), Yotta (1024), Xenna (1027), Vendeka (1033), Googol (10100), etc.
- 1997, Council of Scientific & Industrial Research, Science Reporter Vol. 34, page 23:
- If we try to calculate the mass of earth it comes to 6 xennagrams which is nothing but 6x1024 kilograms or 6x1027 gms.
- 1997, Janet S. Dodd, The ACS style guide: a manual for authors and editors, American Chemical Society, page 140:
- xenna (1027)
- 1999, Sidney Ray, Scientific Photography and Applied Imaging, CRC Press, page 15:
- Table 3.2: Prefixes and symbols of SI units ¶ Prefix; Symbol; Multiplying factor ¶ xenna; X; 1027 ¶ yotta; Y; 1024 ¶ zetta; Z; 1021
- 2002, Roger Blandford, "To the Lighthouse", in: Marat Gilfanov, Rashid Sunyaev and Eugene Churazov (ed.), Lighthouses of the universe: the most luminous celestial objects and their use for cosmology, Springer Science & Business Media, page 394:
- In the limiting case the potential differences along the magnetic field lines approach the impressively large, fundamental "gravitational" value, (Gμ0)1/2c3 ∼ 1XV. (1 xenna eV ≡ 103 yotta eV ≡ 1027eV!)
- 2015, Claude Phipps, No Wonder You Wonder!: Great Inventions and Scientific Mysteries, Springer, page 14:
- The mass of the earth is about 6 Xennagrams, or Xg.
- 2015, Claude Phipps, No Wonder You Wonder!: Great Inventions and Scientific Mysteries, Springer, page 62:
- But that's nothing: our universe is about 0.8 Xm (Xennameters, billions of billions of billions of meters) in diameter.