"constants" - key terms from Wikipedia

association constants
character constants
combining constants
constants
constants	in table
constants	start
coupling constants
determination of equilibrium constants
dimensionless physical constants
dissociation constants
feigenbaum constants
fundamental constants
fundamental constants	of nature
kinetic constants
mathematical constants
physical constants
physical constants	do
propositional constants
sequence of constants
stability constants
stepwise constants
string constants
time constants
variation of the fundamental constants