The Cal Controversy
Not to be confused with the add-on pack for the game Total Annihilation (that's the Core Contingency), the Cal Controversy was first pointed out by Dean the Young. He noted that there were two members whose names were both commonly abbreviated to Cal - CalBear and Calgacus - and when both of them were posting in a thread, it got increasingly confusing as to whose posts were being attributed to who. This was particularly odd because the two of them possessed quite divergent political views.
Dean called for a resolution, but no way of identifying the two was settled on (some people suggested calling Calgacus 'Calg', but this did not catch on). The situation then worsened when at least two other Cal- members joined, Calcion (sometimes called Silent Cal), and Caledor.
Thande System
Thande has unilaterally adopted this system of nomenclature.
Cal#1: CalBear
Cal#2: Calgacus
Cal#3: Calcion
Cal#4: Caledor
Cal#5: Reserved for future Cals.