What is the meaning of Triple-decker?

Something with three levels or storeys.

  1. A bus with three storeys.
  2. A three-storey apartment building.
  3. A sandwich consisting of three levels of filling between four pieces of bread.
  4. A headline that is three lines long.

A bus with three storeys.

A three-storey apartment building.

A sandwich consisting of three levels of filling between four pieces of bread.

A headline that is three lines long.

Source: wiktionary.org