93 is the twenty-eighth distinct semiprime and the ninth of the form (3.q). It is the first number in the third triplet of consecutive semiprimes, 93, 94, and 95. Since its two prime factors, 3 and 31 are both Gaussian primes, this means that 93 is a Blum integer.
In classical Persian finger counting, the number 93 is represented by a closed fist. Because of this, classical Arab and Persian poets around 1 CE referred to someone's lack of generosity by saying that the person's hand made "ninety-three".
^Diaconis, Persi; Graham, Ron (2012), "Chapter 5: From the Gilbreath Principle to the Mandelbrot Set", Magical Mathematics: the mathematical ideas that animate great magic tricks, Princeton University Press, pp. 61–83.