116v

[Koen G]

I suppose that the crosses in those charms mark the points along the recitation when the person should make the sign of the cross, right?

From what I know, if the charm is meant to be spoken then yes and these were referred to as "crucis" "cruces" etc
If it is written, on parchment in an amulet or eaten on a wafer etc, it was more of invoking the powers of the ones/things named in the charm.
"The devotional invocation of the cross, “Behold the cross of the Lord, be gone, evil powers” (Ecce crucem domini, fugite partes aduerse)

That's also what I gather. Maybe more often the second case, even. The written charm is often an example of what the user needs to copy onto something. What sign more powerful than the cross?