Definition - What does Eka mean?
Eka is a Sanskrit word that means "one." The word is used in the names of many yoga poses that involve using one leg to bend or stretch, or to move with the other leg in place. Some of the poses with eka in their names include eka pada dhanurasana, eka pada bakasana and eka pada rajakapotasana.
There is also eka-tattva from Patanjali's Yoga Sutras, which means "to practice one principle." This can be interpreted as cultivating focused awareness on one subject, thing, thought or object at a time. Essentially, it is developing one-pointed awareness so that calmness of mind can arise. Meditation, pranayama and mindfully practicing yoga asanas, are all ways in which to practice eka-tattva.
Yogapedia explains Eka
Eka pada dhanurasana energizes the whole body. It opens the chest, improves lung capacity and promotes balance.
Eka pada bakasana is an excellent arm balance that also challenges arm strength and flexibility. The pose further improves digestion, strengthens the nervous system and improves coordination. The pose has several variations and it is recommended to master the simpler variations before progressing to more advanced variations.
Eka pada rajakopatasana is a hip opener and prepares the body for the full version of rajakapotasana. The pose opens the chest and stretches the inner and outer hips.
Other yoga poses with eka in their names include eka pada sirsasana, eka pada mayurasana and eka pada galavasana.