This is a very interesting picture that I took at one of the temple gates in Roorkee, North India. They are symbols of two major religions of the world together, Hinduism (Om) and Christianity (Holy Cross). I do not know the origins but the very presence in a small temple intrigues me, and reaffirms in inherent broader tolerance present in India, even though it gets tested pretty hard at times. This is from a moderately-sized roadside temple. One may find Hindu and Islamic symbols together on Sufi sites.
Was this symbolism done on purpose or through internalization of the artisan who made the gate, and thought of divinity in a broader context? I would prefer the latter.