Monaco

Monaco is a monospaced sans-serif typeface designed by Susan Kare and Kris Holmes. It ships with macOS and was already present with all previous versions of the Mac operating system. Characters are distinct, and it is difficult to confuse (figure zero) and (uppercase O), or (figure one), (vertical bar), (uppercase i) and (lowercase L). A unique feature of the font is the high curvature of its parentheses as well as the width of its square brackets, the result of these being that an empty pair of parentheses or square brackets will strongly resemble a circle or square, respectively.