In our country units that are derived from the names of scientists are
written with a lower case letter; for instance volt, ampère, watt, etc.;
not Volt, Ampère, Watt. When abbreviated we use a capital letter, so V, A,
W etc. We also write "5 ohm, not 5 Ohms" (no plural).  And we insert a
space between the number and the unit: "3 V and not 3V".
I wonder what the rules are in other countries, inside [including the
UK  :-)]  and outside Europe because I see a lot of variations in spelling
of units on the reflector.
Dick, PA0SE
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The policy with RadCom is almost the same, except we would use ohms plural.
Also the units are close against the number, eg 7.5W. Abbreviations are in
capitals, with no full points between, eg RMS or SWR. Other UK magazines do
things differently. Short Wave Magazine would say s.w.r. - so there are no
country-wide rules.

Mike, G3XDV
former RSGB Publications Manager