Try SOLVING THIS ONE

IT'S A 7 LETTER WORD..

IF WE TAKE 1 LETTER FROM IT, IT REMAINS SAME.

IF WE TAKE 2 LETTERS FROM IT, IT REMAINS SAME.

IF WE TAKE 3 LETTERS FROM IT, IT REMAINS SAME.

IF WE TAKE ALL THE LETTERS FROM IT, STILL IT REMAINS SAME.

WHAT IS IT ?