So, for example, the troy ounce or bushel, the candela or mho might be considered obscure.
From the en.wikipedia.org
In mho, it marks the emergence of contemporary SF as Literature.
From the guardian.co.uk
Personally I believe they'll be forced to start cranking up the printing presses but that is just MHO.
From the guardian.co.uk
So, for example, the troy ounce or bushel, the candela, mho or millibarn might be considered obscure.
From the en.wikipedia.org
It's a bit tokenistic I know, but pictures should mho pique the interest, not just decorate the page.
From the en.wikipedia.org
More examples
A unit of conductance equal to the reciprocal of an ohm
A former unit of electric conductance, equivalent to and superseded by the siemens
(MHOS) Medicare Health Outcomes Survey
A unit of measurement used to denote the electrical conductance of some material. It is the opposite of Ohm, which is used to denote the electrical resistance. This also explains why Mho is Ohm spelled backwards. ...