The Système International sets several standard units and prefixes.

Units:

  • Seconds (s), for time
  • Metres (m), for length
  • Kilograms (kg), for mass
  • Ampere (A), for current
  • Kelvin (K), for temperature
  • Moles (mol), for amounts of substances
  • Candelas (cd), for luminous intensity

Prefixes:

  • : pico (p)
  • : nano (n)
  • : micro ()
  • : milli (m)
  • : kilo (k)
  • : mega (M)
  • : giga (G)
  • : tera (T)