Tietze's graph is the cubic graph on 12 nodes and 18 edges, illustrated above in a number of embeddings.
It is implemented in the Wolfram Language as GraphData["TietzeGraph"].
Tietze's graph is the unique almost Hamiltonian cubic graph on 12 vertices (Punnim et al. 2007). In fact, it is also maximally nonhamiltonian (Clark and Entringer 1983).
Tietze's graph provides a 6-color coloring of the Möbius strip as illustrated above (Bondy and Murty 1976, p. 243).
The plots above show the adjacency, incidence, and graph distance matrices for Tietze's graph.