Examples from the Web for chronogram
There is another near relation of the anagrams and acrostics, which is commonly called a chronogram.Essays and Tales|Joseph Addison
It might be supposed to be a chronogram, but for the introduction of the letter "E."
The date may sometimes occur as a chronogram, which should not be overlooked.
Webster defines a chronogram as an inscription, sentence, or phrase in which certain letters express a date or epoch.
Sometimes it is to be found at the end of the preface or dedication, and sometimes it is on the title-page as a chronogram.