It appertains to the lord of all creatures (Brahma) and was manufactured by the divine architect; it is named Prasvapa, O Bharata. It is not known even to Rama nor to any body else on the earth.
प्राजापत्यं विश्वकृतं प्रस्वापं नाम भारत। न हीदं वेद रामोऽपि पृथिव्यां वा पुमान् क्वचित्।।१२