I noticed on a bistrot's price board, this symbol was used to denote prices. It looks a little bit like an upside-down V, and the closest match shapecatcher.com could find was ⩘. It could also be compared to a segment of a sawtooth wave.
An example of prices from an image of the menu at Brasserie Lola follows (since it’s not my image, I can’t share it):
Entree 1 – €5–
Entree 2 – €7–
Plat 1 – ⩘4,5.
Plat 2 – ⩘3,5.