Siddhasana

(“perfected posture”) One of the common sitting postures (asana) used for
meditation. In this position one foot
(often the left) is placed with the heel in
the area between the anus and genitals,
with the other foot resting on the opposite calf, turned so that the heel is
straight up. This is called the “perfected”
posture partly because of its difficulty—
only those perfected in yoga can do it—
but also because it is believed to bring
substantial spiritual benefits.