A white Malta cross on a black background, one of the insignias attributed to the Knights Hospitaller
From a heraldic Maltese cross with white background.

Converted from the following PostScript code:%!
/l{lineto}def
20 420 moveto 290 310 l
180 580 l 300 500 l 420 580 l
310 310 l 580 420 l 500 300 l
580 180 l 310 290 l 420 20 l
300 100 l 180 20 l 290 290 l
20 180 l 100 300 l closepath
fill
showpage
%%EOF
Cross of the Knights Hospitaller.png
Maltese-Cross-Heraldry.svg