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Items: If a Work contains one or more files as well as nested (child) Works, then its file(s) child Works are referred to collectively as Items.
Knapsack: A layer on top of Hyku that enables customizations without sacrificing maintainability, and upgrade compatibility. Rob Kaufman explains it best in his presentation here.
OCR: Stands for optical character recognition. IIIF Print allows Users to search for specific words within a Work’s universal viewer. To use OCR in your tenant, SSL configuration must be turned on in proprietor home page > Accounts > Edit a tenant or Dashboard > Settings > Account.
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