The concept of 'Self' in buddhist connotation is the ego, the mind. The Buddhist do not have a name for the supreme reality, the supreme truth, hence they term it as 'Shunya' literally meaning nil, nothing, or that which cannot be defined, infinite or valueless.
Jesus was the Son of God, Jesus called the God as the Father, but the Father himself did not. The son addresses his source as 'Father'. the same way, is the understanding of 'Brahman', 'Atman' or the 'Self' addressed by the Vedic seers. Here the concept of 'Self' is the supreme reality, whose nature is by itself, discerned by terms such as 'undefined', 'attribute-less', immeasurable', 'un-quantifiable' - such is that Self.
if this Tatva is known, we can use any term we want provided the term conveys or discerns the essence as above in general.
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