Deletion of Pekro-

Comment: According to http://www.bipm.org/en/si/prefixes.html BIPM, these are not in official use.  The prefixes, as proposed, seem to exist solely on somebody's mindspring.com web page.  This isn't the place for things |made up one day. I can't even call  on this
Stance: delete
Cited policy: Wikipedia:Wikipedia is not for things made up one day (WP:NFT||WP:CRYSTAL)