Letterlike symbols for physical units

From: Andreas Prilop (nhtcapri@rrzn-user.uni-hannover.de)
Date: Fri May 12 2000 - 10:28:41 EDT

The block Letterlike Symbols contains a few symbols for physical units:

U+2103 degree Celsius
U+2109 degree Fahrenheit
U+2113 litre
U+2126 ohm
U+212A kelvin
U+212B ångström

Section 12.2 of the Unicode standard, version 3.0, says:
   In general, the usage of distinct codes for letterlike symbol
   [...] is strongly discouraged.

Does this mean that U+03A9 is preferred for ohm
and that U+00C5 is preferred for ångström?

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