The Ziggurat, also known as "Edge template II1a" or "Template 4-3-2" is one of the most basic non-trivial edge templates. The carrier is very small so this template occurs in real games quite often. The small size of the carrier makes it efficient as a threat of template reduction when building other templates. It also appears sometimes in the middle of the board as an interior template.
This template can be used to prove very easily that a move in the center of a size 5 board is winning.