Elliptical dot
From The Glossary of Digital Photography
A type of halftone dot that has an elliptical shape instead of the more usual round shape. It is designed to give better tonal values, especially in the middle tones. See also halftone

ONLINE GLOSSARY OF DIGITAL PHOTOGRAPY
A type of halftone dot that has an elliptical shape instead of the more usual round shape. It is designed to give better tonal values, especially in the middle tones. See also halftone