Order of magnitude names are terms used to describe the relative size or scale of quantities, measurements, or values in various fields of science, mathematics, and engineering. These terms help express the difference in magnitude between values without specifying exact numbers. Here are the most commonly used order of magnitude names, from largest to smallest:

  1. Yotta- (Y): 10^24 (1 followed by 24 zeros)
  2. Zetta- (Z): 10^21 (1 followed by 21 zeros)
  3. Exa- (E): 10^18 (1 followed by 18 zeros)
  4. Peta- (P): 10^15 (1 followed by 15 zeros)
  5. Tera- (T): 10^12 (1 followed by 12 zeros)
  6. Giga- (G): 10^9 (1 followed by 9 zeros)
  7. Mega- (M): 10^6 (1 followed by 6 zeros)
  8. Kilo- (k): 10^3 (1 followed by 3 zeros)
  9. Hecto- (h): 10^2 (1 followed by 2 zeros)
  10. Deca- (da): 10 (1 followed by 1 zero)
  11. One (no prefix): 10^0 (1)
  12. Deci- (d): 10^-1 (1 divided by 10)
  13. Centi- (c): 10^-2 (1 divided by 100)
  14. Milli- (m): 10^-3 (1 divided by 1000)
  15. Micro- (µ): 10^-6 (1 divided by 1,000,000)
  16. Nano- (n): 10^-9 (1 divided by 1,000,000,000)
  17. Pico- (p): 10^-12 (1 divided by 1,000,000,000,000)
  18. Femto- (f): 10^-15 (1 divided by 1,000,000,000,000,000)
  19. Atto- (a): 10^-18 (1 divided by 1,000,000,000,000,000,000)
  20. Zepto- (z): 10^-21 (1 divided by 1,000,000,000,000,000,000,000)
  21. Yocto- (y): 10^-24 (1 divided by 1,000,000,000,000,000,000,000,000)

These prefixes are used to convey the scale of measurements across various scientific disciplines. For example, gigabytes in computing, megawatts in power generation, and nanometers in nanotechnology. They are particularly useful when dealing with numbers that are too large or too small to express conveniently using standard notation.