The term “arcanum” is deployed in literature to evoke a sense of secret, mystical knowledge that lies just beyond ordinary understanding. It often signifies a hidden principle or method—an enigma of nature or human experience—whether it denotes the supposedly untouchable essence of romance and wisdom ([1], [2]) or serves as a metaphor for profound, elusive truths that can only be accessed by a select few ([3], [4]). At times, “arcanum” is even used to suggest a literal or symbolic reserve of power, such as alchemical secrets or the key to universal order ([5], [6], [7]). Its application extends to naming exclusive societies and institutions, thereby underscoring both its esoteric significance and its grounding in cultural or political contexts ([8], [9], [10]). In these varied contexts, “arcanum” becomes a literary tool that bridges the mundane and the mystical, inviting readers to explore the boundaries of what is known and what remains shrouded in mystery ([11], [12]).