Sutra:
142. thirukkaiyilE pidiththa dhivyAyuthangaLum vaiththanjalenRa kaiyum kaviththa mudiyum mugamum muRuvalum ASanapadhmaththilE azhuththina thiruvadigaLumAy niRkiRa nilaiyE namakkuth thanjam.

Meaning:
The form of the Lord, with the divine hands holding the divine weapons such as the discus and the conch, the divine hand that says never fear (abhaya hasta), the divine crown, the divine face, the divine smile and the divine feet pressed on the lotus, is the refuge to us who are caught in samsaric affliction.

Sri PBA Swami's Sarartha Deepikai:
How are all these qualities seen in the archa form of the Lord (in Sri Ranganatha)?

The divine weapons such as the discus and the conch in His divine hands stand for gnAna and shakti.

The hand that says never fear stands for vAtsalyam.

The divine crown on His divine head stands for svAmitvam.

The divine smile on His divine face stands for sausIlyam.

The divine feet pressed on the lotus, which are easily available to anyone who seeks them, stand for saulabhyam.

This is how Sri Ranganatha is present in archa form and He is our refuge.