Here are some "cheat sheets" I put together that have a list of Byzantine music symbols. They might be helpful for beginners trying to memorize them.
(It now includes the correction mentioned in the following post by "Pappous43".)
Thank you Father Ephraim, very handy.
I think the explanation for argon,diargon,triargon may be misleading.
D.G.Panagiotopoulos in his ΘΕΩΡΙΑ ΚΑΙ ΠΡΑΞΙΣ.... pp. 78-79 gives
the resultant beats for the three notes affected as shown in the attached copy.
P.Katsoulis