Srichurnam can be interpreted as follows: Sri refers to Maha Lakshmi, while churanam literally means powder. Srichurnam is the Yellow line in the middle and it represents Lakshmi. Thiruman (thiru = holy, man = clay) represents the feet Vishnu.
Sri Vaishnavites use Thiruman everyday as a sign of reverence to the divine couple of Maha Vishnu (Sriman Narayana) and Maha Lakshmi. Buy a set of 5 Meenakshi Srichurnam in Yellow from GiriUK