Literary convention

• Traditional literary theme or motif
• Relief maps, informally
• Venetian fishing boats
• Basic concept of drunkard about to secure work

Wikipedia Word definitions in Wikipedia
In mathematics , a topos (, ; plural topoi or , or toposes ) is a category that behaves like the category of sheaves of sets on a topological space (or more generally: on a site ). Topoi behave much like the category of sets and possess a notion of localization; ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"literary theme," 1948, from Greek topos , literally "place."

WordNet Word definitions in WordNet
n. a traditional theme or motif or literary convention; "James Joyce uses the topos of the Wandering Jew in his Ulysses" [also: topoi (pl)]

Wiktionary Word definitions in Wiktionary
n. 1 A literary theme or motif; a rhetorical convention or formula. 2 (context mathematics English) A certain mathematical structure found in category theory.