3:2 chip
From The Glossary of Digital Photography
A digital sensor or chip with an aspect ratio of 3 units wide by 2 units high. This is the same aspect ratio used by 35mm film cameras. See also 16:9 chip; 4/3 Chip

ONLINE GLOSSARY OF DIGITAL PHOTOGRAPY
A digital sensor or chip with an aspect ratio of 3 units wide by 2 units high. This is the same aspect ratio used by 35mm film cameras. See also 16:9 chip; 4/3 Chip