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Recently I've started an experiment called Quantum Wells, I was reading the lab script and came across a familiar looking symbol but could not put my finger on to what it means.

The symbol in question is: Å (an upper-case "A" with a hollow dot [circle] just above of it)

Here's the context: "CdS/ZnS as a function of well width from 3 Å to 60 Å (Ev = 0)"

My question is what does this Å symbol mean? (Natural unit, definition, SI unit...etc)

Thank you in advance.

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# Tried finding out what this symbol means, but to no avail did not find it. Help!

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