  An easily available resource of common crystal structures is essential for
researchers, teachers, and students. For many years this was provided by the
U.S. Naval Research Laboratory's $Crystal\ Lattice\ Structures$ web page, which
contained nearly 300 crystal structures, including a majority of those which
were given $Strukturbericht$ designations. This article presents the updated
version of the database, now including 288 standardized structures in 92 space
groups. Similar to what was available on the web page before, we present a
complete description of each structure, including the formulas for the
primitive vectors, all of the basis vectors, and the AFLOW commands to generate
the standardied cells. We also present a brief discussion of crystal systems,
space groups, primitive and conventional lattices, Wyckoff positions, Pearson
symbols and $Strukturbericht$ designations.
