Final answer:
The given type string_or_int = | String of string | Int of int is a variant as a tagged union in OCaml.
Step-by-step explanation:
The given type string_or_int = | String of string | Int of int is a variant as a tagged union.
In OCaml, a tagged union is created using the | character to separate the different types of the variant. Each type is then followed by a constructor, which is used to create values of that type.
In this case, the variant has two types: String and Int. The constructors String and Int are used to create values of those types, which can then hold a string or an integer value, respectively.