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.

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myriad

1) 10,000 - (Roman)
2) an unspecified large number (of things) - (Greek)
3) the reciprocal of permyriad (‱)

I will be busy today as I have myriad things to do.
There are myriad fish in the sea.
The universe has myriad stars, planets and comets.

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mung

Non-specific liquid found in un-clean places.

Garbage - Trash = mung

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permille

Also, permil, per mil, per mille, promille
1) per (every) thousand (Latin)
2) one thousandth

3) the fraction 1/1000

4) the decimal 0.001

5) the symbol ‰

Baseball batting averages are written as a permille.
Legal limits blood alcohol content for driving a road vehicle in some countries are 0.5‰ or 0.2‰.