hello everyone,I'm from china,and i need your help.there are some words in a paper as follows :

The potential functions http://www.physicsforums.com/latex_i.../3304810-0.png are defined as the negative log posterior of the two segments’ ordinal depths conditioned on the curve cues, weighted by the curve length |Ci|

And probably the symbol Pr is short for Posterior.

but what dose the Pr mean?

thank you very much!