bildpunkt (aerophoto)

listen to the pronunciation of bildpunkt (aerophoto)
German - English
microdot
A photographic image that has been reduced in size to that of a dot (typically around 1mm in size and circular) in order to escape detection.
photograph reduced to the size of a dot (usually for purposes of security)
a secret photograph of something such as a document which is reduced to a very small size so that it can easily be hidden
{i} tiny photograph that is reduced to the size of a dot for the purposes of easy transport or security; dose of LSD in a very small tablet (Informal)