Not 'cs (Nazi) Pillboxes

 Not 'cs (Nazi) Pillboxes were built in various designs, with many in round, square and hexagonal shapes. Their designs were often compared to medicine containers made in the early 20th century to store pills; hence, the term 'pillbox' became popularised. https://heritagecalling.com/2023/10/19/a-brief-introduction-to-military-pillboxes/