Key
Key noun - An explanatory list of the symbols on a map or chart.
How words are described
Both words in one sentence
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In "Dark Water", a spare TARDIS key is hidden in a book which looks much newer than any of the other books on the shelf with it.
Source: Conspicuously Light Patch -
Recursive Canon: Among other books, "Locke and Key" can be seen on a shelf in the first issue of Crown of Shadows when Nina finds the echo key.
Source: Comic Book / Locke & Key -
You can notice that the gap between the top of the spines and the upper 'shelf' is covered by a leather flap and the key hole is far more substantial than for the glass doors of the real bookshelves.
Source: Book Safe
Cite this Source
Shelf and Key. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/key/shelf
Key & Shelf. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/key/shelf>.
Shelf or Key. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/key/shelf.
Google Ngram Viewer shows how "key" and "shelf" have occurred on timeline