Sri Appayya Dikshita writes in his book, Sivatattvaviveka
We are not very much worried about whether it is Vishnu or Siva who is
the supreme deity spoken of by the Upanishads because we follow
Advaita. But it is impossible for one like me to keep quiet when men
with perverted minds proclaim in abusive language their hatred toward
Siva by calling these ...
Sri vaiShNava use branding of the conch and discus of viShnu as shown in this recording of a real initiation and this movie scene of one.
This article from a sri vaiShNava thirumaligai (religious center) says:
The AchAryA embosses the impressions of Conch (Shankam) and Discus (Sudarshana chakram) on the left and right arms of the disciple, ...