Hi Al, or also if you happen to know for sure that a space character is actually a valid units label in either of those labeling systems, let me know if that is actually the case so I can get that to be recognized.

[MIL12] is:
Abbreviations for Use on Drawings, Specifications, Standards, and in Technical Documents
(MIL-STD-12D), U.S. Department of Defense, May 1981.


And [IEE260] is:
IEEE Standard Letter Symbols for Units of Measurement (ANSI/IEEE Std 260),
Institute of Electrical and Electronics Engineers, 1978.


But those are all about abbreviations and letter symbols for different units - it seems pretty unlikely that a blank space character would be listed in either of them as a type of unit system abbreviation.


- Michael