Most of the very first radiographs (called shadowpictures by Röntgen and later termed skiagrams, skiagraphs, radiograms, rontograms and several other variants until the term radiographs finally became universally accepted) were of coins, keys and similar objects X-rayed through some opaque material; small mammals and hands (although seldom feet). The earliest classification termed hands and animals (such as frogs) 'liv ing ’ radiographs whereas the remainder were not prefaced by an adjective.