Sewing needles that are appropriate for embroidery are called "crewel" needles. These needles have a long eye and a sharp point, which makes them ideal for working with embroidery floss and other decorative threads.
Crewel needles are also often slightly thicker than other types of needles, which allows them to accommodate thicker threads and prevent them from breaking or fraying while being used for embroidery.
While other types of needles, such as sharps, straights, and betweens, can also be used for embroidery, crewel needles are generally preferred because of their unique combination of a long eye, sharp point, and slightly thicker size, which makes them ideal for working with decorative threads and creating intricate embroidery designs.