D, Develops the Ground

The great god-king Geb is the symbol of the earth, which is one of the reasons why he is often depicted as a reclining man. This makes it complicated to lay out, as it takes up the space of several characters.

In hieroglyphics, its representation goes linear by watering down its limbs and simplifying its silhouette.
It will become the summary juxtaposition of two triangles with inverted points which appears during the transition to Proto-Canaanite, the dalet.
Even more refined, the preservation of a single triangle gives the Phoenician delt symbol of the gate of which the Greek delta is the direct heir.

It would be possible to depict him seated and, on a throne, but less explicitly. He was not a dull god; he took happy initiatives that made him the second unifying God-King of Upper Egypt.