Good idea to have a glossary for the acronyms and 'puter short-hands. I was familiar enough with most of the ones for both canonical and schismatic Orthodox groups, but I kept forgetting what "ISTM" means, and Serge uses that a lot.
Oh, another canonical Orthodox jurisdiction: UOC(of)USA=Ukrainian Orthodox Church of the USA (under the EP). And Ukrainian Orthodox Church-Moscow Patriarchate (canonical)=UOC-MP,and Ukrainian Orthodox Church-Kiev (or Kyiv) Patriarchate (uncanonical)=UOC-KP.
If we keep getting Anglican postings, then (P)ECUCA=(Protestant) Episcopal Church of the USA should be there too. And perhaps the UGCC=Ukrainian Greek Catholic Church also. PNCC=Polish National Catholic Church.