Jib
On boats with only one jib, it is common for the clew of the jib to be further aft than the mast, meaning the jib and mainsail overlap. An overlapping jib is called a genoa jib or simply a genoa (see illustration). These are efficiently used when  reaching more broadly than a close reach. Alternatively, a boat may carry smaller jibs, to compensate aerodynamics when the mainsail is  reefed; these more rugged sails are called storm jibs or spitfires.