The Daddy of all SI Units

The International System of Units, more commonly abbreviated to SI, is devised around seven base units.
But none is more base than the newly introduced eighth.
Self-Interest (SI).
Unlike other SI units which have the convenience of the number ten, this one has the inconvenience of being linked to politicians.
The inconvenience is theirs.
As the world’s most widely used system of measurement, it recognises the fact that, whether from the Outer Hebrides or Outer Mongolia, all politicians are slimeballs.
Ask your local MP what his SI value is.
If yours is lower, you're a banker.
And for once, that is not rhyming slang.