Is Synthetix an ERC20?

As a keen observer in the world of cryptocurrency and finance, I often come across various tokens and projects, each claiming to offer unique functionalities and value propositions. One such project that has caught my attention recently is Synthetix. However, I must confess that I'm still a bit hazy on the technical underpinnings of this token. Specifically, I'm wondering if Synthetix is an ERC20 token. Given that ERC20 is a widely adopted standard for tokens built on the Ethereum blockchain, it's crucial to understand if Synthetix falls under this category. Clarifying this point would help me gauge its interoperability and potential integration with other Ethereum-based projects and services. So, could you kindly elaborate on whether Synthetix is indeed an ERC20 token?