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∆ may refer to: . Triangle (∆), one of the basic shapes in geometry. Many different mathematical equations include the use of the triangle.; Delta (letter) (Δ), a Greek letter also used in mathematics and computer science
In its archaic form, θ was written as a cross within a circle (as in the Etruscan or ), and later, as a line or point in circle (or ).. Greek theta variant in cursive form.