S

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

secondary extinction
selection rules
selective merohedry
semidirect product
serial reflection conditions
sharpened Patterson function
site symmetry
Sohncke groups
space group
spherical system
stabilizer
statistical descriptors
stereographic projection
structure amplitude
structure determination
structure factor
structure-factor coefficient
subcell
subgroup
sublattice
subperiodic group
supercell
supergroup
superlattice
superposition methods
superspace
superspace group
superspace point group
symmetry element
symmetry operation
symmorphic space groups
systematic absences