A pangram is a sentence of any length containing every letter of the alphabet. Obviously the ultimate achievement in this field is an example containing each letter once only. Unfortunately, all the minimum-length 26-letter pangrams that have been constructed over the years seem to have the same problem: they are in some way an abbreviation. For example:
"An Unabbreviated 26-Letter Pangram,"
Word Ways: Vol. 21
, Article 7.
Available at: http://digitalcommons.butler.edu/wordways/vol21/iss4/7