An LB is an L-shaped conduit body whose second hub exits the back, opposite the removable cover, so a run coming down an outside wall can turn 90 degrees into the building. Siblings follow the same code: held with the cover facing you and the inline hub pointing down, an LL turns left and an LR right, a T has three hubs and a C runs straight. Wire is pulled through the cover opening, splices are allowed only in bodies marked with a volume, and each one counts as a pull point for the 360-degree rule.
Come down the outside wall into an LB, punch through the block, and you're right in the back of the panel.
Condulet (a Crouse-Hinds trademark) and Unilet (an Appleton one) both mean any conduit body, so ask for an LB by name.
Related terms
Ninety
Shop name for a 90-degree conduit bend, whether factory-made or bent on site.
Pipe
Shop word for conduit of any kind, and as a verb for installing it, as in pipe it.
Chase nipple
Short threaded fitting with a flat collar that joins two boxes or enclosures through their knockouts.
Rigid
Heavy-wall threaded steel conduit, the toughest raceway on site, used for services, exposed runs and hazardous areas.