An interrogative pronoun is a pronoun that appears at the beginning of a clause/sentence and indicates that the clause/sentence is an interrogative question rather than an indicative statement.
In Biblical Hebrew, a family of interrogative particles function as interrogative pronouns, and many scholars use the terms “interrogative pronouns” and “interrogative particles” interchangeably. The two most common interrogative particles are מִי (personal interrogative pronoun, referring to a person) and מָה (impersonal interrogative pronoun, referring to a thing). These two pronouns can also function as indefinite pronouns, especially when they appear in the middle of a clause/sentence rather than at the beginning. As a general rule, the particles מִי or מָה function as interrogative pronouns when they appear at the beginning of a clause/sentence, and function as indefinite pronouns when they appear in the middle of a sentence or clause. However, this is not a universal rule; the specific use of these pronouns must always be determined from the context.