a form of LSD

A type of LSD in a colorful tiny pill.

tiny tablet containing LSD

photograph reduced to the size of a dot (usually for purposes of security)

A photographic reduction of a secret message so small it can be hidden in plain sight under the period at the end of this sentence.

A miniature picture the size of the head of a pin. Microdots are shrunken pictures that can be transported underneath a postage stamp on a letter. The agent receiving the microdots has a microdot viewer that enlarges the picture so that it is readable. Microdots can also be hidden in-between the layers of a book binding and any where else that one can imagine. Microdot Viewer

Small pips of pulled sprue.

The Microdot is a concept design by William Towns for a small, economical town car. The car was first shown in 1976 and was an evolution of his 1972 Minissima car.