Numbers which can be attached to paragraphs in a hyper-text writing system.
Makes them individually into AddressableThings
In a sense it breaks the document into SmallerPieces.
Compare the discussion about PurpleNumbers on ConcretePageNames
In a sense, cards are like purple numbers.
Also, what people in the ToolsForThought community seem to call BlockReferences
Discussion with ChrisDent :
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