P

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

partial symmetry
Patterson methods
Patterson vector
phase of a modulation
phase problem
piezoelectricity
pleochroism
point configuration
point group
point space
point symmetry
polar lattice
polymorphism
polytypism
preferred orientation
primary extinction
primitive basis
primitive cell
priority rule
pseudo symmetry
pyroelectricity