Trikonasana - Triangle Pose
"Tri" means "three", "Kona" means "angle", and "Trikona" means "triangle" in Sanskrit The straight legs with the floor between the feet resemble the three sides of a triangle in this asana. Hence the name.
Urdhvamukha Svanasana - Upward-facing dog pose
This pose is also called Downward Dog or Downward-Facing Dog.
Ushtrasana - Camel Pose
"Ushtra" means "camel" in Sanskrit.
Vajrasana - Adamant Pose
"Vajra" means "adamant" in Sanskrit. Sitting in this asana will provide firmness or stability to the sitter like that of an adamant person. Hence the name.