Input that looks like a vertical line?

I'm looking over a file someone else made (I jusut have the image of it not the .mw), and there's a line that looks like this:

H1|
    | t=0.45.

H1 is an equation is set from an interpolation expansion line, and I believe this input solves the equation when the variable t is equal to 0.45. But how do I enter this into Maple? Thanks.