my family were 'hamburgers'
with a few prussians thrown in for stoicism and a couple of austro-hungarians for the pastries & goulash. plattdeutsch was occasionally heard mixed in with hoch deutsch and a smattering of english when granny forgot the german word...
a SD card is a 'secure digital' solid state memory device.
and is used in digital cameras to store photos.
the romans were the masters of digital 'photography' which we now call 'mosaics', hence my somewhat cheeky excursion into fantasies above: