By Swami Harshananda
Stobha literally means ‘letters used in praise’.
In Sāmavedic chants, certain letters like hā-u, hā-i, hum, ho, ohā, ī and u are used for musical interjections and interpolated into a sāman. They are actually additional letters and not a part of the letters.
- The Concise Encyclopedia of Hinduism, Swami Harshananda, Ram Krishna Math, Bangalore