What is an aelf elf?

Could you elaborate on the concept of an 'aelf elf' in the cryptocurrency and blockchain context? I've heard it mentioned in relation to the aelf blockchain, but I'm not entirely clear on its role and function. Is it a type of token, a smart contract, or a component of the overall architecture? What are the key characteristics and benefits of an aelf elf? Furthermore, how does it contribute to the scalability, interoperability, and overall ecosystem of the aelf blockchain? I'd appreciate a concise yet informative explanation to help me gain a better understanding of this term.