Significance of this number:

@sonhouse said
18.3 megohms/square

Lindt 95% Cacao bars.

Donald Trump's brain.

I give up.

@sonhouse said
18.3 megohms/square

I'd have to google megohm to get a clue as I've never heard the term before

@sonhouse said
18.3 megohms/square

Sheet resistivity of some special surface. But which one?

@sonhouse said
18.3 megohms/square

I'm not familiar with the unit, so I looked it up. It looks like a similar unit megohm-cm is a more common measure of the resistivity of liquids, and the first page I looked at I found this:

https://www.omega.com/en-us/resources/conductivity-resistivity

18.3 megohm-cm is listed as Reveal Hidden Content

I'm still not clear on how that relates to the megohms/square unit

@venda said
I'd have to google megohm to get a clue as I've never heard the term before

Ohm = the unit of electrical resistance.

Megohm = 1 million Ohms.