Number of nodes with and without channels.
Unique = any channel connecting nodes directly for the first time. Duplicate = a parallel or reciprocal channel between nodes that are already connected.
Cumulative bitcoin capacity across all channels.
Channel capacity statistics.
The maximum number of hops required to reach another node (among shortest paths).
Density is a ratio of actual / potential channels.
Transitivity is the ratio of potential triangles present. A value of 1 means every path of length 2 loops back into a triangle. Clustering coefficient is the ratio of interconnections between a node's peers. A value of 0 means the node is a hub, and none of its peers are connected. A value of 1 means the node forms a clique with its peers.
A cut channel (aka cut edge, or bridge) is a channel between two nodes that connects different components of the network. This channel's removal would prevent other nodes from having a path. A cut node (aka cut vertex) is the same idea, except it's a crucial node instead of a channel.
Channels involving a node.
Capacity across all channels involving a node.