Real number
quantity along a continuous line
rational number
integer
constructible number
non-negative real number
conic constant
Foias constant
pi
decimal number
extended real number line
Fission product yield
Khinchin's constant
Bernstein's constant
almost integer
one and a half
reciprocal Fibonacci constant
illegal number
irrational number
Feigenbaum constants
number with infinite decimal representation
Legendre's constant
Graham's number
Seshadri constant
Euler's constant
Catalan's constant