Clusters of twisted strands of β sheet are called
Most β sheets are not perfectly flat but tend to have a right-handed twist. Clusters of twisted strands of β sheet, sometimes referred to as β barrels, form the core of many globular proteins.
Ref: Harper’s illustrated biochemistry. 30th edition page no: 39
Amphiphatic helices
β barrels
Loops and bends
Supersecondary structures