Sir, I bear a rhyme excelling,
In mystic force and magic spelling.
Celestial sprites elucidate,
All my own striving can't relate.
What Am I ?
This site has many more of this.
http://www.xs4all.nl/~jcdverha/scijokes/11_2.html#subindex
This is a Mneumonic for the value of Pi.
3.14159265 .... etc