Shiva Purana
उद्वेजयति मर्माणीत्युदानो वायुरीरितः ॥ समं नयति सर्वांगं समानस्तेन गीयते ॥ ३८ ॥
Udāna is the vital air that affects the vulnerable points in the body among the limbs. The vital air that spreads equally is called Samāna.
english translation
udvejayati marmANItyudAno vAyurIritaH ॥ samaM nayati sarvAMgaM samAnastena gIyate ॥ 38 ॥
hk transliteration by Sanscript