Yudhishthira fixed various appellation so that by uttering them they might be known to others that they belong to the Pandava force.
शय्याश्च विविधास्तात तेषां रात्रौ युधिष्ठिरः। एवंवेदी वेदितव्यः पाण्डवेयोऽयमित्युत॥