My feeling is based on the following idea: Expected behaviour of financial data could have ordering properties. For example one may expect the increase in price of some stock in a given time period. Of course, more complicated behaviours based on a partial ordering could be also possible.
You are right. Isotonic regression is a non parametric approach with application to different fields, finances among them
Hlávka, Z. (2003). Constrained estimation of state price densities (Vol. 22). Discussion Paper 2003.
Aıt-Sahalia, Y., & Duarte, J. (2003). Nonparametric option pricing under shape restrictions. Journal of Econometrics, 116(1), 9-47.
Reader, M., van de Geer, S. A., & Mitchell, C. Regression under shape restriction and the option price model.
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