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  2. British Rail regional multiple unit numbering - Wikipedia

    en.wikipedia.org/wiki/British_Rail_regional...

    Sprinter (Class 15x) units carried the last three digits of their carriage numbers in the 52xxx and 57xxx series. The 6xx series was reserved for the aborted Class 157, and was adopted by refurbished Class 143 601-625 and 101 651-695. Refurbished class 117 and 122 kept their Tyseley 3xx and Laira (Western Region) 1xx unit numbers respectively.

  3. Unit of measurement - Wikipedia

    en.wikipedia.org/wiki/Unit_of_measurement

    A unit of measurement, or unit of measure, is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. [1] Any other quantity of that kind can be expressed as a multiple of the unit of measurement. [2] For example, a length is a physical quantity.

  4. Names of large numbers - Wikipedia

    en.wikipedia.org/wiki/Names_of_large_numbers

    This became the "unit of the third numbers", whose multiples were the third numbers, and so on. Archimedes continued naming numbers in this way up to a myriad myriad times the unit of the 10 8-th numbers, i.e. () =, and embedded this construction within another copy of itself to produce names for numbers up to (() ()) =.

  5. British Rail locomotive and multiple unit numbering and ...

    en.wikipedia.org/wiki/British_Rail_locomotive...

    Of course, many exceptions arose over time. One major change was to change the classification of unpowered trailer units from 49x numbers to 4x8 numbers (which involved reclassifying Class 491 to Class 438). When Southern Region unit numbers were changed to fit with the TOPS classification system, former 4x0 classes were all reclassified to 4x2.

  6. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    This new symbol can be raised to a positive or negative power. It can also be combined with other unit symbols to form compound unit symbols. [1]: 143 For example, g/cm 3 is an SI unit of density, where cm 3 is to be interpreted as (cm) 3. Prefixes are added to unit names to produce multiples and submultiples of the original unit. All of these ...

  7. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.