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In the completed graph there are not one but two signifying chains.
The lower chain (from the signifier to the voice) is the conscious signifying chain, the level of the statement.
The upper chain (from jouissance to castration) is the signifying chain in the unconscious, the level of the enunciation.
The structure is thus duplicated: the upper part of the graph is structured exactly like the lower part.
Lacan introduces two new siglas here: S(
O) and ($<>D).
These two siglas from the upper part of the graph hold a position structurally homologous to the position of the symols O and s(O) from the lower part.