Abbreviations and Acronyms for Use on Drawings and Related Documents 2007: Engineering Drawing and Related Documentation Practice, Amse Y14.38
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From the first page we learn, " Scope
The abbreviations and acronyms, hereinafter referred to as "abbreviations," listed in this Standard are used on engineering drawings and related documentation.
The intent of this Standard is to allow the use of approved abbreviations in lieu of the use of complete words or terminology. Abbreviations defined by this Standard need not be additionally defined by the using drawing or related document. It is not the intent of this Standard to include abbreviations defined or established in other standards such as those for scientific terms and notations. However, an exception is made for those abbreviations that have widespread use and recognition, for example, AM for amplitude modulation, and FM for frequency modulation (radio). "