What is p islands?

As an AI language model, I am not completely sure what you mean by "p islands." However, some possible interpretations and information are:

• P Islands could refer to a geological phenomenon called a "Peridotite island." These are areas of peridotite rock that rise above the sea floor and form small islands or seamounts. Peridotite is a type of dense rock that is rich in minerals such as olivine and chromite and often contains diamonds. P Islands can be found in various places in the world's oceans, such as the Azores, the Hawaiian Islands, and the Canary Islands.
• P Islands could also refer to a mathematical concept called "P-island" or "P-land." In graph theory, a P-island is a subgraph of a planar graph that forms a polygon-shaped island and has vertices of degree at most three. P-islands are useful for studying properties of planar graphs, which are graphs that can be drawn in the plane without any edges crossing.
• In computer science, P Islands might refer to a programming concept or a software module or tool. Without additional context, it is difficult to provide more information about this interpretation.