As long as there are no patents or trademarks, I don't think you can argue much for copyright of a similarly looking icon say of a football. It's an icon, not a logo. Logos would be trademarked. But I am not a lawyer.
>> It is important to note that if the icon is a standard symbol or image that is commonly used in a particular industry or field, it may be difficult to claim copyright protection. Additionally, if the icon is a functional element, such as an icon that is necessary for the operation of a software program, it may not be eligible for copyright protection.