It is named 'ego'

 

 “The body is insentient, the Self does not rise,

  Between the body’s limit an ‘I’ rises,

  Between the body and Self.

  It is named ‘ego’, ‘knot of matter and spirit’,

              ‘bondage’, ‘subtle body’ and ‘mind’.”               

Forty Verses on Reality, V.24

 

“Born of forms, rooted in forms,

Feeding on forms, ever changing its forms,

Itself formless, this ego-ghost

Takes to its heels on enquiry.”

Forty Verses on Reality, V.25,

 

“When the ‘I’ – thought rises, all this is perceived,

When the ‘I’ – thought subsides, all this subsides,

Therefore all these are but forms of the ‘I’ thought.

Tracking it is the way to victory over everything.”

Forty Verses on Reality, V.26,

                                                        Sri Ramana Maharshi