A set of cards is called a pack of cards. It begins with the letter p.
A posy.
procurement cards (p-cards)
One fabric beginning with P is poplin.
A slippery metallic beginning with P could be pewter or platinum.
The name of a large flat fish beginning with "P" is a "Plaice."
To me, I believe that a power set is not empty. Here is my thought: ∅ ∊ P(A) where P(A) is the power set and A is the set. This implies: ∅ ⊆ A This means that A = ∅, but ∅ ∉ A. ∅ ∊ A if A = {∅} [It makes sense that ∅ ∊ {∅}]. Then, {∅} ⊆ A, so {∅} ∊ P(A) = {∅, {∅}}. That P(A) is not empty since it contains {∅} and ∅.
A disaster beginning with 'N' could be a natural disaster like a tsunami. A disaster beginning with 'P' could be a pandemic or a hurricane, for example.
ace in a pack of cards
PLATINUM
* paste
Pentagon.
Pluto