Orthodoxy is the second largest Christian communion in the world, with an estimated 300 million adherents."
The Eastern rites want you to "make no mistake" by confusing the Orthodox Catholic Church with the Roman Catholic Church.
"The Orthodox Church considers itself to be both orthodox and catholic. In earlier and patristic usage, the Church usually referred to herself as the "Catholic Church"[1][2] whose faith was the "Orthodox faith". Such usage is still reflected today in the Orthodox liturgy, e.g. "unite them to your Holy, Catholic and Apostolic Church" (from the litany of the catechumens, Liturgy of St. John Chrysostom).
The interior of an Eastern Orthodox Church.
Simonos Petras Monastery, Athos, Greece
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Happy Blue Monday! (meme)