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I have noticed that the names denoting the sacred body part of Lord Vishnu and Lord Shiva are Padmanabha and Shivalinga respectively.
I am thinking "Head" is the sacred body part of Lord Brahma.
But what is the appropriate word for it similar to "Padmanabha" and "Shivalinga" described anywhere in Hindu Literature?
metonymy: the substitution of the name of an attribute or adjunct for that of the thing meant, for example suit for business executive, or the track for horse racing.
Padmanabha "navel-lotus-ed" is a name of Vishnu
neela-kantha "blue-mecked" is a name of Siva.
Chaturmukha "four-headed" is a name of Brahma.
This figure of speech is ubiquitous in Sanskrit - like "kiriti" = "crowned" for Arjuna.
The part used to represent the whole is not any more sacred than the rest of the body of the deity.