From: usenet@listmail.good-stuff.co.uk 
  
 On Sun, 10 Aug 2025 08:17:56 +0100, Jeff Layman  
 wrote: 
 > 
 >Apologies for the misordered acronym. If it's any consolation I kept 
 >getting it wrong myself - as you can see! I suppose that the creator of 
 >the acronym wanted to keep "m" for "metres", but it still looks odd 
 >having a lower-case letter followed by three upper-case letters. 
  
 'm' is the SI abbreviation for metres. 'M' is the SI abbreviation for mega 
 (as in MB). AOD is the recognised abbreviation for Above Ordnance Datum. The 
 latter is not case sensitive, but the former is. So maod would be valid in 
 this contect, but MAOD would mean something else entirely. mAOD, thoughm is 
 both precise and easily understood. 
  
 Mark 
  
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