 Tāḍāsana is from the Sanskrit words ताड "tāḍa", "mountain" and आसन "āsana" meaning "posture" or "seat".Samasthitiḥ is from सम "sama" meaning "equal", level", or "balanced"; स्थिति "sthiti", "stand".The pose is unknown in hatha yoga until the 20th century "Light on Yoga", but the pose appears in the 1896 "Vyayama Dipika", a manual of gymnastics, as part of the "very old" sequence of "danda" (Sanskrit for "staff" or "stick") exercises.