Reply To: punctuation w/single Letter abbreviations Home › Forums › Nemeth Code for Math and Science › punctuation w/single Letter abbreviations › Reply To: punctuation w/single Letter abbreviations June 21, 2011 at 9:14 am #20934 Chris ClemensKeymaster Code Pg. 59 Rule VIII--Sec. 52 Abbreviations must be punctuated in the literary mode, provided that the punctuation is at the same level as that abbreviation.