و آر ایل:https://img.rawpixel.com/s3fs-private/rawpixel_images/website_content/pf-icon-02855-chim.jpg?w=400&dpr=1&fit=default&crop=default&auto=format&fm=pjpg&q=75&vib=3&con=3&usm=15&bg=F4F4F3&ixlib=js-1.1.1&s=2ed8fd91105ed358d532ae607900a083
و آر ایل:https://www.rawpixel.com/search/mathematical symbol
