The nc, nb, and ne are the collector, base, and emitter nodes, respectively, and ns is the (optional) substrate node. If unspecified, ground is used. The modname is the model name, area specifies the area factor, temp specifies the operating temperature, and off indicates an initial condition of the device for the dc analysis. If the area factor is omitted, a value of 1.0 is assumed. The initial conditions specified using ic or alternatively icvbe and icvce are intended for use with the uic option in transient analysis, when a transient analysis is desired starting from other than the quiescent operating point. The .ic line provides another way to set transient initial conditions.
More information can be found in the description of the bjt model in 2.17.8.