Arrondi

Arrondi, or arrondie, in heraldry, as in cross-arrondi, or rounded, is that whose arms are composed of sections of a circle, not opposite to each other, so as to make the arm bulge out thicker in one part than another; but both the sections of each arm lie the same way, so that the arm is of a uniform thickness throughout. All of them terminate at the edges of the escutcheon like the plain cross.

...
Wikipedia