beta-sheet

https://doi.org/10.1351/goldbook.12626
Secondary 3D structure of a protein that takes on a flat, pleated appearance.
Note: Other common protein structural motifs are the alpha-helix and beta-barrel.
Source:
PAC, 2013, 85, 1725. (Glossary of terms used in medicinal chemistry. Part II (IUPAC Recommendations 2013)) on page 1728 [Terms] [Paper]