Why Tamil Hindus put Pillayar Suzhi on top of the letter?

My mother puts first Pillayar Suzhi on top of the letter, even when she is preparing a list of items to be bought, she puts Pillyar Suzhi first on the top. Pl enlighten me on the spiritual significance of this tradition followed by mainly Hindu Tamils. How this came first? who invented this letter ? What is... show more My mother puts first Pillayar Suzhi on top of the letter, even when she is preparing a list of items to be bought, she puts Pillyar Suzhi first on the top.

Pl enlighten me on the spiritual significance of this tradition followed by mainly Hindu Tamils.
How this came first? who invented this letter ? What is the Spiritual significance of this ?
Update: Edit: Gugglu Sir , I thought that only Tamil Hindus put Pilliyar Suzhi, hence i mentioned Tamil Hindus.
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