Graphlet counting in a network characterises its local topologies.

<p>(A) In total, there are 30 different graphlets containing 2 to 5 nodes, ranging from <i>G</i>₀ to <i>G</i>₂₉. Orbits are an extension of graphlets which also take into account the position of a node within a graphlet. The 73 different orbits are coloured in red. (B) By counting the occurrences of these graphlets in the network, the local topology surrounding a node can be quantified.