What does SHANKA & CHAKRA represent?

SANKHA & CHAKRAM
The Sankha and Chakra, the religious symbols of the Sri Vaishnavites, are the sacred weapons of Lord Vishnu.

About Sankha:

The Sankha or the Conch has the form of a multiple spiral evolving from one point into ever increasing spheres. This symbolises the origin of the Universe from a single source,

What is Tridandam and its significance?

The Tridandam the Jeeyar carries is composed of three split bamboo strips.
They represent the 3 realities 1) The Nature; 2) The soul and 3) The God. The three should never be separated. To them is tied the fourth which represents the Sanyasi’s Acharya who acts as the intercessor between God and the Soul.