nLab plot

Idea

Given a generalized space $X$ conceived as a concrete sheaf $X \in Sh(Charts)_{\sharp_1} \hookrightarrow Sh(Charts)$ on a site $Charts$ of local model spaces, a plot of $X$ over a $U \in Charts$ is an element of $X(U) \in Set$, hence (under the Yoneda lemma) is a morphism $U \to X$ from that local model space to $X$.

References

For diffeological spaces the term was coined in

• Patrick Iglesias-Zemmour, p. 26 of: Diffeology, Mathematical Surveys and Monographs, AMS (2013) (web, ISBN:978-0-8218-9131-5)