In heraldry, a cross botonny is a variation on the cross crosslet, with rounded ends. It was not treated as a distinct cross until the 17th century. In the SCA the name is used as a guide to anybody who wishes to emblazon the arms, but it is considered a cross crosslet for the purposes of conflict checking.
Examples in SCA heraldry
The Barony of St Florian de la Riviere uses a cross botonny in its device.