Examples in Go
Go supports constants of character, string, boolean, and numeric values.
package main

// Declare two individual constants. Yes,
// non-ASCII letters can be used in identifiers.
const π = 3.1416
const Pi = π // equivalent to: Pi == 3.1416

// Declare multiple constants in a group.
const (
	No         = !Yes
	Yes        = true
	MaxDegrees = 360
	Unit       = "radian"
)

func main() {
	// Declare multiple constants in one line.
	const TwoPi, HalfPi, Unit2 = π * 2, π * 0.5, "degree"
}