The Seal
A black Latin cross, surrounded by a two-ring Crown of
Thorns, with the letters “C”, “R”, “I”, and “U” in the
quadrants of the cross. This stands for Christus Rex,
Imperator Universi
, which means Christ the King, the
Ruler of the Universe
.
The Crown of Thorns is, of course, an obvious symbol of Christ the King, and devotion to it and the sufferings of it which Our Lord endured for our sake is central to the CCR. The cross and the letters speak for themselves.
The Seal (which can be used in any color) is used most frequently in print, where colors are often an issue, and anywhere a simple insignia is needed.