pilaster

/pɪˈlastə/

IPA: /P AH0 L AE1 S T ER0/

noun
  1. 1

    A rectangular column that projects partially from the wall to which it attached; it gives the appearance of a support, but is only for decoration.

  2. 2

    A column or short wing wall attached to the foundation wall which provides lateral support, or to support a vertical load that does not fall on the foundation wall.

Source: https://en.wiktionary.org/wiki/pilaster