What is the symbol for Ethereum (ETH) & Bitcoin (BTC)?

Could you please clarify the specific symbols used to represent Ethereum and Bitcoin in the cryptocurrency world? I'm aware that these are two of the most prominent digital currencies, but I'm not entirely certain about their official or commonly used symbols. For Ethereum, I've heard the term "ETH" being used quite frequently, but I'd like to confirm if that's the official or commonly accepted symbol. Similarly, for Bitcoin, I've encountered the abbreviation "BTC" in various contexts. Is this the accurate representation of Bitcoin's symbol, or is there another symbol that's more widely recognized? Clarifying these symbols would greatly assist me in navigating the cryptocurrency landscape.