In Hindu mythology, Lord Shiva is considered "Sayambhu," meaning he is self-born, appearing from the universe itself, essentially "coming out from the earth naturally" as he is seen as the primordial being present even before creation, not born from a parent or human form; this is why he is often referred to as the "Adi-Deva" (the first god).
Key points about Shiva's origin:
No birth story:
Unlike other gods, Shiva is not described as being born from a mother; he is believed to have always existed.
Symbolic representation:
The "lingam," a phallic symbol often associated with Shiva, represents this concept of self-creation and the cosmic energy that permeates everything.