keywords

bipartite
In a bipartite net vertices are in two sets and vertices of each set are only linked to those of the other set. The only nets so identified have vertices with two different coordination numbers.
chiral
This selects all structures with one of the 65 space groups with only proper operations (operations of the first kind), viz. rotation, screw or translation.
clathrate
This term is used to refer to 4-coordinated nets based on simple tilings by polyhedra with faces with up to 6 sides. mtn and mep are the nets of type I and II clathrate hydrates.
good
"good" structures have all shortest distances corresponding to equal lengths and the next shortest distance > 1.4 times as large, and/or have the order of the point symmetry at the vertices > 7.
polar
This selects nets with polar symmetry (i.e. those of classes 1, 2, m, 3, 3m, 4, 4m, 6, 6m).
regular net
There are 5 regular nets in which the vertices have a regular polygon or polyhedron as vertex figure. For their natural tilings the transitivity is 1111. Delgado-Friedrichs, O. F.; O'Keeffe, M.; Yaghi, O. M. Acta Cryst. 2003, A59, 22-27. [transitivity pqrs means p kinds of vertex, q kinds of edge, r kinds of tile face, s kinds of tile]
rod net
The rod nets are the nets of 2-, 3- and 4-way invariant cylinder (rod) packings as described by Rosi et al. J. Am. Chem. Soc. 2005, 127, 1504.
self dual net
A self-dual net is a net that has a tiling that is self-dual. In some cases the self-dual tiling is not the natural one and is given in parentheses in "tiling".
semiregular net
Semiregular nets have one kind of vertex and one kind of edge (vertex and edge transitive, or transitivity 11rs). Delgado-Friedrichs, O. F.; O'Keeffe, M.; Yaghi, O. M. Acta Cryst. 2003, A59, 515-525.
simple tiling
In a simple tiling 2 tiles meet at a face, 3 at an edge and 4 at a vertex. the tiles are simple polyhedra (2 faces meet at each edge and 3 at each vertex). There are nine vertex-transitive simple tilings [choose keyword "simple tiling" and nets with one kind of vertex]. Their duals are the nine ways of tiling space with congruent polyhedra. See Delgado-Friedrichs, O.; Huson, D. H. Discr. Comp. Geom. 1999, 21, 299-315. Delgado-Friedrichs, O.; O'Keeffe, M. Acta Cryst. 2005, A61, 358-362.
uniform net
In a uniform net the shortest rings contained in each angle are the same size. See especially A. F. Wells, Three dimensional nets and polyhedra. Wiley, New York 1977.
uniform tiling
In a uniform tiling, all the vertices are the same (uninodal or vertex transitive) and the tiles are all uniform polyhedra (vertex transitive with regular polygonal faces). Grünbaum, B. Geombinatorics 1994, 4, 49-56. Deza, M.; Shtogrin, M. Eur. J. Combinatorics 2000, 21, 807-814.

The correspondences with Grünbaum's numbers are:

1fcu 11hex 21hal
2hcp 12tsi 22pcu
3tcd 13svk 23fst
4tca 14sve 24fee
5flu-e 15svh 25lta
6crs 16tfs 26bnn
7reo 17svj 27rho
8cab 18kag 28sod
9reo-e 19ttw
10ubt 20pcu-i
weaving
This selects structures with only 2-coordinated vertices (i.e. containing threads or loops). Such structures only appear when "weaving" is selected.
zeolite net
These nets appear in the Atlas of Zeolite Structure Types http://www.iza-structure.org/databases. Note that we always use a maximum symmetry configuration. Generally we only include zeolite nets with one or two kinds of vertex.

Note that zeolites have a 3-letter (upper case, bold) framework code ABC. Generally the RCSR symbol for that net has the same letters abc. However some zeolite codes were assigned after RCSR symbols for the net and the letters do not match. These are with corresponding RCSR symbol: ACO = pcb, BCT = crb, BSV = gie, RWY = sod-a.