I (re)found this link which contains a list of common noda or abbreviations used by scribes instead of writing out endings, etc., in full:

http://www.scribhinn.org/lamhscr.html

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

Great site a Bhreandáin

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Please wait for corrections/ more input from other forum members before acting on advice

I can't find 'agoa' anywhere - it's obviously not very thorough.........

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Aye, the 9th century's monks would seldom write "agoa" in their manuscripts

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne