ayyappa idol very much different from other hindu idols. Usually three positions are there in which the hindu idols can be seen erected in the temples Sitting, Standing or lying. Ayyappa’s sitting posture is called yoga asana, which is different from the posture of other idols. Yogasana is meditating post.
The lap is not kept free, like other Gods which has the worldly meaning of providing space to the concert. The left lap is considered to be the seat or place for wife/ concert. Ayyappan is considered as the Brahmachari ( observing celibacy) Naishtika Brahmachari. Unlike other Gods who sits on flowers or thrones, ayyappa sits on pita (on feet)
Ayyappa's posture more like balancing on foot rather than on sitting on the hip. Balancing on foot is difficult and not an enjoyable posture. The belt on legs has many stories associated with it. But the underlying meaning is maintaining a territory of observance. It shows the control over the mind. Abhaya mudra is set on his fingers, which shows fearlessness.