the fourth letter of the Greek alphabet (Δ, δ), transliterated as ‘d’

a code word representing the letter D, used in radio communication

a difference between two things or values

there's a delta between perception and reality

as long as the price delta is not too great, consumers can be sold on specs and future-proofing

variation of a variable or function

a finite increment

the discriminant of a quadratic equation

declination

a triangular tract of sediment deposited at the mouth of a river, typically where it diverges into several outlets

the Nile delta

a huge delta system developed