What type of a cog is a two face?

In the context of machinery or mechanisms, a "two-face" cog typically refers to a gear with two distinct surfaces or profiles that can perform different functions or interact with other components in varying ways. This design can enhance versatility and efficiency in mechanical systems. However, the term is not standard in engineering, so it may also refer to a character or concept in popular culture, such as the DC Comics character Two-Face, which represents duality and conflicting identities.