$FCDefaultLightconeVectorNB is a global variable which is set to FCGV[“nb”]. It denotes the default name for the vector nˉ\bar{n}nˉ in the lightcone decomposition for Lorentz tensors.
$FCDefaultLightconeVectorNB
Overview, MemSet, FCMemoryAvailable.
FCGV(nb)\text{FCGV}(\text{nb})FCGV(nb)