A pangram is a sentence that includes all the letters of the alphabet and is still meaningful.
Several 26-letter pangrams have been created, but all of them contain obscure words, abbreviations, initials or Roman numerals. The exclusion of those words led to the shortest panagram of 30 letters.
How quickly daft jumping zebras vex.
Other pangrams are:
Jackdaws love my big sphinx of quartz. (31 letters)
Pack my box with five dozen liquor jugs. (33 letters)
A quick brown fox jumps over the lazy dog. (33 letters)
Xylophone wizard begets quick jive form. (34 letters)
Lazy movers quit hard packing of jewelry boxes. (39 letters)
By Jove, my quick study of lexicography won a prize. (41 letters)
Sexy zebras just prowl and vie for quick hot matings. (43 letters)
Six plump boys guzzled cheap raw vodka quite joyfully. (45 letters)
Sixty zippers were quickly picked from the woven jute bag. (48 letters)
Crazy Fredericka bought many very exquisite opal jewels. (48 letters)
Freight to me sixty dozen quart jars and twelve black pans. (48 letters)
How razorback-jumping frogs can level six piqued gymnasts! (49 letters)
(Extracted from the Guinness Book of Words)
Of course, the more letters you use, the easier they are to form. Can you think of any other?