permyriad

1) one ten-thousandth
2) the fraction 1/10,000
4) the decimal 0.0001
5) 1 percent of 1 percent (1% of 1%)
6) the reciprocal of myriad
7) the symbol ‱
8) a basis point (in finance), 1/100th of a percentage point, abbreviated "bp"

There has been a 5 permyriad rise in the price of that commodity.

by Nutralizr October 25, 2011

Permeriod

Short for "permanent period" - usually in reference to one's whose demeanor has a somewhat heavy flow and needs a both a tampon AND a pad, just in case

"Looks like Sheila is your moon sister"
"She's always on her period"
"You mean permeriod?"

by wiznerd1 August 16, 2012