Enter a clue or pattern or both:

The Clue

Friedrich units, for short (3 letter answer)

The Answer

ACS

Tags


Notes

The answer ACS is common and appears about once every 325 puzzles.

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Definition

AC as a noun:

1. (actinium, Ac, atomic number 89) = a radioactive element of the actinide series; found in uranium ores
2. (alternating current, AC) = an electric current that reverses direction sinusoidally; "In the US most household current is AC at 60 cycles per second"