An array of the names of four cities might be referred to as city₀, city₁, city₂, and city₃, or as city[0], city[1], city[2], and city[3].

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In programming, arrays are zero-indexed, meaning the first element is accessed with the index 0. Therefore, an array of four cities can indeed be referred to using indices 0 through 3, as in city[0], city[1], city[2], and city[3]. The notation with subscripts (city₀, city₁, etc.) is a mathematical or conceptual representation, while the square bracket notation (city[0], city[1], etc.) is commonly used in programming languages like JavaScript, Python, and many others to access array elements.

An Array of the Names of Four Cities Might Be