A good indicator in forex business should have several characteristics, including accuracy, reliability, ease of use, and compatibility with the trader's trading style and strategy. It should also provide timely and actionable signals, offer customization options, and have a proven track record of success. A good indicator should not rely on subjective analysis, but instead, use objective data and statistics to inform trading decisions. It's important to thoroughly research and test an indicator before using it in live trading, to ensure it meets these criteria and is suitable for your individual needs and goals.