German to English Tech/Engineering Medical: Instruments dosimeter

Hi folks.

Translating the test report for a dosimeter used in the medical field. They are checking whether the units are correct. Then I hit this sentence:

Die radiologischen Einheiten müssen mit einfach hohen Zeichen dargestellt werden, die elektrischen mit doppelt hohen.

So, what are 'einfach hohe Zeichen'?

The pages following are just the fields to be used to record the information and there are no items there that have 'hohe Zeichen' of any kind.

So, does this have to do with height of the font? Or is it that the exponent is squared (doppelt), or what?

So, anybody hit this term before? Any good guesses?

All contributions gratefully accepted.

Thanks for reading.