• u (micro) = 0.000001 (prefix)
• u = AMU (mass)
• U = micron (length)
• u0 = magnetic field (permeability)
• UK ("UK ") = replacement for "imp "
• UK (British) = 1.000002
• UK = replacement for "British"
• UK = replacement for "imperial"
• UK bushel (British bushel) = 4 UK peck (volume)
• UK caliber (British caliber) = 0.001
• UK fl oz = UK oz fluid (volume)
• UK fluid oz = UK oz fluid (volume)
• UK gallon (British gallon) = 277.41945 in^3*approx (volume)
• UK mile (British mile) = 1609.34721869 m (length)
• UK oz = UK oz fluid (volume)
• UK oz fl = UK oz fluid (volume)
• UK oz fluid (British fluid ounce) = 0.05 UK pint (volume)
• UK peck (British peck) = 554.84 in^3*approx (volume)
• UK pint (British pint) = 0.5 UK quart (volume)
• UK quart (British quart) = 0.25 UK gallon (volume)
• UK quintal (British quintal) = 100 pound (mass)
• UK quintal2 (British quintal) = 112 pound (mass)
• UK thermal unit = BTU (energy)
• uncia (Roman uncia) = 420 grain (mass)
• unciae = uncia (mass)
• undec = 11 (prefix)
• universal gas (constant) = 8.31434 J/mol*K (molar heat capacity)
• Unknown Units
  • avogadro (Avogadro's number) = 6.022169E+23 1/mol*approx
  • faraday (Faraday constant) = 96486.7 C/mol
  • Fdy = faraday
  • gravitation (constant) = 0.00000000006664 N*m^2/kg^2
  • L = avogadro
  • Na = avogadro
  • refrigeration = 12000 BTU/ton*hour
  • stefan-boltzmann (Stefan-Boltzmann constant) = 0.000000056697 W/m^2*K^4
• US dollar = $ (currency)

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