You can see a quote which is showing in front of temple , "tatwamasi" . This simply means that "It's you". The concept of adwaitha (non-duality) shows here. By saying the same name "Ayyappa" together, it shows that we all, including the lord Ayyappa, are equal. The same Brahman exist in each and everyone of us.
As @Surya mentioned, the dhyana shoka is for Dharma Sashta and not Ayyappa, considered an avatara of him.
The name for this posture is not clear as it's called by different names like, Arddhasana, Yogapadasana or Yogarudha Siddhasana.
The posture of Ayyappa involves multiple elements of iconography,
When a deity is represented in sitting form, his/her ...
There is very good explanation on Haringo.com blog.
This url is the source of following information.
(Disclaimer :- I do not have any association with that webpage.)
Following part is borrowed from there with sincere thanks to the website.
Irumudi Kattu means two packages. The front pouch is meant for Lord
Iyappan, this pouch contains the Ghee ...
This is a kind of question which should be answered by the yogis or those who are in those lines, those who converse with the divine power, rather than scholars who read books which itself is many times altered and wild and creative imagination for a noble purpose. As per the tantrik beliefs, both are different, one born as a human, and the other is siva-...
Theoritically they are different.
Ayyappan was the adopted son of the king of pandalam, actually the son of Shiva and Mohini. He was a Nitya Bramhachari. (https://en.wikipedia.org/wiki/Ayyappan)
But Dharma Sastha means a man who has the power to make and implement dharmas or righteousness in the society. He also has 2 wives. (http://vipasana-vidushika....