/usr/share/xml/udunits/udunits2-accepted.xml is in libudunits2-0 2.2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
Copyright 2008, 2009 University Corporation for Atmospheric Research
This file is part of the UDUNITS-2 package. See the file COPYRIGHT
in the top-level source-directory of the package for copying and
redistribution conditions.
Units accepted for use with the SI
-->
<unit-system>
<!-- Hour, degree, liter, and the like -->
<unit>
<def>60 s</def>
<name><singular>minute</singular></name>
<symbol>min</symbol>
</unit>
<unit>
<def>60 min</def>
<name><singular>hour</singular></name>
<symbol>h</symbol>
<aliases> <symbol>hr</symbol> </aliases>
</unit>
<unit>
<def>24 h</def>
<name><singular>day</singular></name>
<symbol>d</symbol>
</unit>
<unit>
<!-- This "unit" is useful in the definition of subsequent
units. -->
<def>3.141592653589793238462643383279</def>
<aliases>
<name><singular>pi</singular><noplural/></name>
<symbol>π</symbol> <!-- GREEK SMALL LETTER PI -->
</aliases>
</unit>
<unit>
<def>(pi/180) rad</def>
<name><singular>arc_degree</singular></name>
<symbol>°</symbol> <!-- DEGREE SIGN -->
<aliases>
<name><singular>angular_degree</singular></name>
<name><singular>degree</singular></name>
<name><singular>arcdeg</singular></name>
</aliases>
</unit>
<unit>
<def>°/60</def> <!-- DEGREE SIGN -->
<name><singular>arc_minute</singular></name>
<symbol>'</symbol>
<symbol>′</symbol> <!-- PRIME -->
<aliases>
<name><singular>angular_minute</singular></name>
<name><singular>arcminute</singular></name>
<name><singular>arcmin</singular></name>
</aliases>
</unit>
<unit>
<def>'/60</def>
<name><singular>arc_second</singular></name>
<symbol>"</symbol>
<symbol>″</symbol> <!-- DOUBLE PRIME -->
<aliases>
<name><singular>angular_second</singular></name>
<name><singular>arcsecond</singular></name>
<name><singular>arcsec</singular></name>
</aliases>
</unit>
<unit>
<!-- The following is exact. From 1901 to 1964, however, 1
liter was 1.000028 dm^3 -->
<def>dm^3</def> <!-- exact -->
<name><singular>liter</singular></name>
<symbol>L</symbol> <!-- NIST recommendation -->
<aliases>
<name><singular>litre</singular></name>
<symbol>l</symbol>
</aliases>
</unit>
<unit>
<def>1000 kg</def>
<name><singular>metric_ton</singular></name>
<symbol>t</symbol>
<aliases> <name><singular>tonne</singular></name> </aliases>
</unit>
<!-- Units whose values are obtained experimentally -->
<unit>
<def>1.60217733e-19 J</def>
<name><singular>electronvolt</singular></name>
<symbol>eV</symbol>
<aliases>
<name><singular>electron_volt</singular></name>
</aliases>
</unit>
<unit>
<def>1.6605402e-27 kg</def>
<name><singular>unified_atomic_mass_unit</singular></name>
<symbol>u</symbol>
<aliases>
<name> <singular>atomic_mass_unit</singular> </name>
<name> <singular>atomicmassunit</singular> </name>
<name> <singular>amu</singular><noplural/></name>
</aliases>
</unit>
<unit>
<def>1.495979e11 m</def>
<aliases>
<name><singular>astronomical_unit</singular></name>
<symbol>ua</symbol>
</aliases>
</unit>
<!-- Units temporarily accepted for use with the SI. NB: <name>
and <symbol> elements appear only within <aliases>. -->
<unit>
<def>1852 m</def>
<aliases>
<name><singular>nautical_mile</singular></name>
</aliases>
</unit>
<unit>
<def>nautical_mile/hour</def>
<aliases>
<name><singular>international_knot</singular></name>
<name><singular>knot_international</singular></name>
<name><singular>knot</singular></name>
</aliases>
</unit>
<unit>
<def>1e-10 m</def>
<aliases>
<name><singular>angstrom</singular></name>
<name><singular>ångström</singular></name>
<symbol>Å</symbol> <!-- LATIN CAPITAL LETTER A
WITH RING ABOVE -->
<symbol>Å</symbol> <!-- ANGSTROM SIGN -->
</aliases>
</unit>
<unit>
<def>dam^2</def>
<aliases>
<name><singular>are</singular></name>
<symbol>a</symbol>
</aliases>
</unit>
<unit>
<def>100 are</def>
<aliases> <name><singular>hectare</singular></name> </aliases>
</unit>
<unit>
<def>100 fm^2</def> <!-- exact -->
<aliases>
<name><singular>barn</singular></name>
<symbol>b</symbol>
</aliases>
</unit>
<unit>
<def>1000 hPa</def>
<aliases>
<name><singular>bar</singular></name>
</aliases>
</unit>
<unit>
<def>cm/s^2</def>
<aliases>
<name><singular>gal</singular></name>
</aliases>
</unit>
<unit>
<def>3.7e10 Bq</def>
<aliases>
<name><singular>curie</singular></name>
<symbol>Ci</symbol>
</aliases>
</unit>
<unit>
<def>2.58e-4 C/kg</def>
<aliases>
<name><singular>roentgen</singular></name>
<symbol>R</symbol>
</aliases>
</unit>
<!-- The following is commented-out because "rad" has already
been mapped to "radian"
<unit>
<def>cGy</def>
<aliases> <name><singular>rad</singular></name> </aliases>
</unit>
-->
<unit>
<def>cSv</def>
<aliases>
<name><singular>rem</singular></name>
</aliases>
</unit>
</unit-system>
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