Single post in Delta mini sprite marker

I'd want to know how the totem symbol was done - was it applied to the sprites in an image editor, or is it there by coding sort of floating the marker on top? Delta aura would be tricky to see on such small sprites, and not always visible depending on what your site skin looks like (eg. Dark type deltas are basically invisible to me because I use a dark skin) - what about just marking the Sprite with a generic delta icon?