User blog comment:Scorcher007/S - Large Countable Ordinal Notation. Chapter I, Up to KPm./@comment-35470197-20190912034735/@comment-31580368-20190912141539

If we are talking about a specific ordinal, then you can think of these ordinals not as additions, but as axiom "the universe is this ordinal". But if we are talking about colection, then the term "existence" will be used more correctly.