<appendix id="units"> 
  <title>Units</title> 
  <para>
	 This appendix lists the decimal multipliers and unit abbreviations to use
	 in GNOME documentation.
  </para>
  <sect1 id="units-1"> 
	 <title>Multipliers</title> 
	 <para>
		To avoid awkward strings of zeroes, large numbers are usually written in
		a shorthand power-of-ten format. A multiplier is added to the unit as a prefix
		to indicate the appropriate order of magnitude. You can use the following types
		of multipliers:
	 </para>
	 <variablelist>
		<varlistentry>
		  <term>Decimal multipliers</term>
		  <listitem>
			 <para>
				Indicate the order of magnitude of a number in the decimal system.
			 </para>
		  </listitem>
		</varlistentry>
		<varlistentry>
		  <term>Binary multipliers</term>
		  <listitem>
			 <para>
				Indicate the order of magnitude of a number in the binary system.
			 </para>
		  </listitem>
		</varlistentry>
	 </variablelist>
	 <para>
		The following table lists decimal multipliers.
	 </para>
	 <table frame="topbot" id="recabb-TBL-4"> 
	 <title>Decimal Multipliers</title> 
	 <tgroup cols="3" colsep="0" rowsep="0"><colspec
		colname="COLSPEC4" colwidth="89.25pt"/>
		<colspec colname="COLSPEC5" colwidth="1.00*"/><colspec colname="COLSPEC6"
		colwidth="1.53*"/> 
		<thead> 
		  <row rowsep="1" valign="top"> 
			 <entry valign="top"> 
				<para>
				  Multiplier 
				</para>
			 </entry> 
			 <entry valign="top"> 
				<para>
				  Abbreviation
				</para>
			 </entry> 
			 <entry valign="top"> 
				<para>
				  Order of Magnitude
				</para>
			 </entry> 
		  </row> 
		</thead> 
		<tbody> 
		  <row> 
			 <entry colname="COLSPEC4"> 
				<para>
				  peta 
				</para>
			 </entry> 
			 <entry colname="COLSPEC5"> 
				<para>
				  P</para>
			 </entry> 
			 <entry colname="COLSPEC6"> 
				<para>
				  10<superscript>15</superscript>
				</para>
			 </entry> 
		  </row> 
		  <row> 
			 <entry> 
				<para>
				  tera 
				</para>
			 </entry> 
			 <entry> 
				<para>
				  T</para>
			 </entry> 
			 <entry> 
				<para>
				  10<superscript>12</superscript>
				</para>
			 </entry> 
		  </row> 
		  <row> 
			 <entry> 
				<para>
				  giga 
				</para>
			 </entry> 
			 <entry> 
				<para>
				  G</para>
			 </entry> 
			 <entry> 
				<para>
				  10<superscript>9</superscript>
				</para>
			 </entry> 
		  </row> 
		  <row> 
			 <entry> 
				<para>
				  mega 
				</para>
			 </entry> 
			 <entry> 
				<para>
				  M</para>
			 </entry> 
			 <entry> 
				<para>
				  10<superscript>6</superscript>
				</para>
			 </entry> 
		  </row> 
		  <row> 
			 <entry> 
				<para>
				  kilo 
				</para>
			 </entry> 
			 <entry> 
				<para>
				  k</para>
			 </entry> 
			 <entry> 
				<para>
				  10<superscript>3</superscript>
				</para>
			 </entry> 
		  </row> 
		  <row> 
			 <entry> 
				<para>
				  deci 
				</para>
			 </entry> 
			 <entry> 
				<para>
				  d</para>
			 </entry> 
			 <entry> 
				<para>
				  10<superscript>-1</superscript>
				</para>
			 </entry> 
		  </row> 
		  <row> 
			 <entry> 
				<para>
				  centi 
				</para>
			 </entry> 
			 <entry> 
				<para>
				  c</para>
			 </entry> 
			 <entry> 
				<para>
				  10<superscript>-2</superscript>
				</para>
			 </entry> 
		  </row> 
		  <row> 
			 <entry colname="COLSPEC4"> 
				<para>
				  milli 
				</para>
			 </entry> 
			 <entry colname="COLSPEC5"> 
				<para>
				  m</para>
			 </entry> 
			 <entry colname="COLSPEC6"> 
				<para>
				  10<superscript>-3</superscript>
				</para>
			 </entry> 
		  </row> 
		  <row> 
			 <entry colname="COLSPEC4"> 
				<para>
				  micro 
				</para>
			 </entry> 
			 <entry colname="COLSPEC5"> 
				<para>
				  u</para>
			 </entry> 
			 <entry colname="COLSPEC6"> 
				<para>
				  10<superscript>-6</superscript>
				</para>
			 </entry> 
		  </row> 
		  <row> 
			 <entry> 
				<para>
				  nano 
				</para>
			 </entry> 
			 <entry> 
				<para>
				  n</para>
			 </entry> 
			 <entry> 
				<para>
				  10<superscript>-9</superscript>
				</para>
			 </entry> 
		  </row> 
		</tbody> 
	 </tgroup> 
	 </table> 
	 <para>
		The following table lists binary multipliers.
	 </para>
	 <table frame="topbot" id="recabb-TBL-5"> 
	 <title>Binary Multipliers</title> 
	 <tgroup cols="3" colsep="0" rowsep="0"><colspec
		colname="COLSPEC4" colwidth="89.25pt"/>
		<colspec colname="COLSPEC5" colwidth="1.00*"/><colspec colname="COLSPEC6"
		colwidth="1.53*"/> 
		<thead> 
		  <row rowsep="1" valign="top"> 
			 <entry valign="top"> 
				<para>
				  Multiplier 
				</para>
			 </entry> 
			 <entry valign="top"> 
				<para>
				  Abbreviation
				</para>
			 </entry> 
			 <entry valign="top"> 
				<para>
				  Order of Magnitude
				</para>
			 </entry> 
		  </row> 
		</thead> 
		<tbody> 
		  <row> 
			 <entry colname="COLSPEC4"> 
				<para>
				  Kilo 
				</para>
			 </entry> 
			 <entry colname="COLSPEC5"> 
				<para>
				  K</para>
			 </entry> 
			 <entry colname="COLSPEC6"> 
				<para>
				  2<superscript>10</superscript> = 1024
				</para>
			 </entry> 
		  </row> 
		  <row> 
			 <entry> 
				<para>
				  Mega 
				</para>
			 </entry> 
			 <entry> 
				<para>
				  M</para>
			 </entry> 
			 <entry> 
				<para>
				  2<superscript>20</superscript> = 1,048,576
				</para>
			 </entry> 
		  </row> 
		</tbody> 
	 </tgroup> 
	 </table>
  </sect1> 
  <sect1 id="units-2"> 
	 <title>Unit Abbreviations</title> 
	 <para>
		This section provides guidelines about the correct unit abbreviations to
		use in GNOME documentation.
	 </para>
	 <itemizedlist> 
		<listitem> 
		  <para>
			 The form for abbreviations is the same for both singular and plural.
		  </para>
		</listitem> 
		<listitem> 
		  <para>
			 Be aware of the distinction between uppercase and lowercase letters,
			 especially for the prefixes.
		  </para>
		</listitem> 
		<listitem> 
		  <para>
			 Avoid using units in titles and headings.
		  </para>
		</listitem> 
		<listitem> 
		  <para>
			 Spell out the full name of the unit for clarity where necessary.
		  </para>
		</listitem> 
	 </itemizedlist> 
	 <para>
		The recommended units in the following table are based on the
		<emphasis>Systeme International d'Unites</emphasis> (SI) system of units. The
		table is not an exhaustive list of all SI units. The table only includes those
		units that occur in the desktop, or in GNOME documentation. If you need to use
		units that are not defined in the table, send your suggestions to: Pat Costello
		<email>docs@gnome.org</email>
	 </para>
	 <table frame="topbot"> 
	 <title>Recommended Units for GNOME Documentation</title> 
	 <tgroup cols="4" colsep="0" rowsep="0" align="left"><colspec colnum="1"
		colname="col1" colwidth="1.00*" align="left" colsep="0" rowsep="0"/><colspec
		colnum="2" colname="col3" colwidth="1.21*" align="left" colsep="0"
		rowsep="0"/><colspec colnum="3" colname="col4" colwidth="2.32*" align="left"
		colsep="0" rowsep="0"/><colspec colname="col04" colnum="4" colwidth="2.44*"/> 
		<thead> 
		  <row rowsep="1" valign="top"> 
			 <entry colname="col1" align="left" valign="top" rowsep="1"> 
				<para>
				  Term 
				</para>
			 </entry> 
			 <entry colname="col3" valign="top" align="left"> 
				<para>
				  Unit 
				</para>
			 </entry> 
			 <entry colname="col4" valign="top" align="left"> 
				<para>
				  Example
				</para>
			 </entry>
			 <entry colname="col04" valign="top" align="left">Abbreviated
				Example</entry> 
		  </row> 
		</thead> 
		<tbody> 
		  <row rowsep="0" valign="top"> 
			 <entry colname="col1" align="left" valign="top"> 
				<para>
				  bit 
				</para>
			 </entry> 
			 <entry colname="col3" align="left" valign="top"> 
				<para>
				  b</para>
			 </entry> 
			 <entry colname="col4" align="left" valign="top"> 
				<para>
				  48 Kilobit
				</para>
			 </entry>
			 <entry colname="col04" align="left" valign="top">
				<para>
				  48 Kb
				</para>
			 </entry> 
		  </row> 
		  <row rowsep="0" valign="top"> 
			 <entry colname="col1" align="left" valign="top"> 
				<para>
				  byte 
				</para>
			 </entry> 
			 <entry colname="col3" align="left" valign="top"> 
				<para>
				  B</para>
			 </entry> 
			 <entry colname="col4" align="left" valign="top"> 
				<para>
				  10 Megabytes
				</para>
			 </entry>
			 <entry colname="col04" align="left" valign="top">
				<para>
				  10 MB
				</para>
			 </entry> 
		  </row> 
		  <row rowsep="0" valign="top"> 
			 <entry colname="col1" align="left" valign="top"> 
				<para>
				  decibel 
				</para>
			 </entry> 
			 <entry colname="col3" align="left" valign="top"> 
				<para>
				  dB 
				</para>
			 </entry> 
			 <entry colname="col4" align="left" valign="top"> 
				<para>
				  100 decibels
				</para>
			 </entry>
			 <entry colname="col04" align="left" valign="top">
				<para>
				  100 dB
				</para>
			 </entry> 
		  </row> 
		  <row rowsep="0" valign="top"> 
			 <entry colname="col1" align="left" valign="top"> 
				<para>
				  degree Celsius
				</para>
			 </entry> 
			 <entry colname="col3" align="left" valign="top"> 
				<para>
				  <superscript>o</superscript>C 
				</para>
			 </entry> 
			 <entry colname="col4" align="left" valign="top">
				<para>
				  Zero degrees Celsius
				</para>
			 </entry>
			 <entry colname="col04" align="left" valign="top">
				<para>
				  0 <superscript>o</superscript>C 
				</para>
			 </entry> 
		  </row> 
		  <row rowsep="0" valign="top"> 
			 <entry colname="col1" align="left" valign="top"> 
				<para>
				  degree Fahrenheit 
				</para>
			 </entry> 
			 <entry colname="col3" align="left" valign="top"> 
				<para>
				  <superscript>o</superscript>F 
				</para>
			 </entry> 
			 <entry colname="col4" align="left" valign="top">
				<para>
				  32 degrees Fahrenheit
				</para>
			 </entry>
			 <entry colname="col04" align="left" valign="top">
				<para>
				  32 <superscript>o</superscript>F 
				</para>
			 </entry> 
		  </row> 
		  <row rowsep="0" valign="top"> 
			 <entry colname="col1" align="left" valign="top"> 
				<para>
				  hour 
				</para>
			 </entry> 
			 <entry colname="col3" align="left" valign="top"> 
				<para>
				  h</para>
			 </entry> 
			 <entry colname="col4" align="left" valign="top"> 
				<para>
				  24 hours
				</para>
			 </entry>
			 <entry colname="col04" align="left" valign="top">
				<para>
				  24 h
				</para>
			 </entry> 
		  </row> 
		  <row rowsep="0" valign="top"> 
			 <entry colname="col1" align="left" valign="top"> 
				<para>
				  inch 
				</para>
			 </entry> 
			 <entry colname="col3" align="left" valign="top"> 
				<para>
				  in 
				</para>
			 </entry> 
			 <entry colname="col4" align="left" valign="top"> 
				<para>
				  12 inches
				</para>
			 </entry>
			 <entry colname="col04" align="left" valign="top">
				<para>
				  12 in
				</para>
			 </entry> 
		  </row> 
		  <row rowsep="0" valign="top"> 
			 <entry colname="col1" align="left" valign="top"> 
				<para>
				  meter 
				</para>
			 </entry> 
			 <entry colname="col3" align="left" valign="top"> 
				<para>
				  m</para>
			 </entry> 
			 <entry colname="col4" align="left" valign="top"> 
				<para>
				  1 kilometer = 1000 meters
				</para>
			 </entry>
			 <entry colname="col04" align="left" valign="top">
				<para>
				  1 km = 1000 m
				</para>
			 </entry> 
		  </row> 
		  <row rowsep="0" valign="top"> 
			 <entry colname="col1" align="left" valign="top"> 
				<para>
				  minute of time
				</para>
			 </entry> 
			 <entry colname="col3" align="left" valign="top"> 
				<para>
				  min 
				</para>
			 </entry> 
			 <entry colname="col4" align="left" valign="top"> 
				<para>
				  10 minutes
				</para>
			 </entry>
			 <entry colname="col04" align="left" valign="top">
				<para>
				  10 min
				</para>
			 </entry> 
		  </row> 
		  <row rowsep="0" valign="top"> 
			 <entry colname="col1" align="left" valign="top"> 
				<para>
				  second of time
				</para>
			 </entry> 
			 <entry colname="col3" align="left" valign="top"> 
				<para>
				  s</para>
			 </entry> 
			 <entry colname="col4" align="left" valign="top"> 
				<para>
				  30 milliseconds
				</para>
			 </entry>
			 <entry colname="col04" align="left" valign="top">
				<para>
				  30 ms
				</para>
			 </entry> 
		  </row> 
		</tbody> 
	 </tgroup> 
	 </table> 
  </sect1> 
</appendix> 
