Conjoined busts facing the same direction slightly offset from each other in such a way as to allow the bottom bust to be partially seen while the top bust is shown in its entirety.
Found on http://www.encyclo.co.uk/local/10142
having the leaflets in pairs, as a pinnate leaf. · having a jugum. · (of two or more portraits on a coin, medal, or escutcheon) overlapping. Found on https://www.infoplease.com/dictionary/jugate