'Ashtanga' means literally 'eight-limbed' ('ashta' = eight; 'anga' = limb).
The following information can be found at http://www.yoga-centers-directory.net/info/yoga_style_glossary.htm:
Ashta-anga Yoga is the Eight-Fold Path of Yoga taught by Patanjali in the 'Yoga Sutras'. On this path, Hatha Yoga is used to prepare for the higher spiritual practices of Raja Yoga.
The Eight-Fold Path / The Eight Limbs:
1. Yama (moral observance)
2. Niyama (self-restraint)
3. Asana (posture)
4. Pranayama (breath control)
5. Pratyahara (sensory inhibition)
6. Dharana (concentration)
7. Dhyana (meditation)
8. Samadhi (Union with God, ecstasy, nirvana).
1. Yama (moral observance)
2. Niyama (self-restraint)
3. Asana (posture)
4. Pranayama (breath control)
5. Pratyahara (sensory inhibition)
6. Dharana (concentration)
7. Dhyana (meditation)
8. Samadhi (Union with God, ecstasy, nirvana).
Ashta-anga Yoga is also known as: 'Ashtanga Yoga', 'Astaunga Yoga', 'Classical Yoga', 'Patanjali Ashtanga', and 'Raja Yoga'.