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I have two identical electrical plugs which fit side-by-side. It is important to get them the right way around as they will both fit in either socket.

I would like to write something on each of the two plugs to remind myself which way they plug in.

I could write COR on one and RECT on the second, so that when plugged in side-by-side they will read CORRECT. When plugged in the wrong way around they will say RECTCOR which is obviously a mistake, so this is one possibility.

However I am wondering whether there is something better - two groups of letters that will mean correct/good/safe when placed next to each other in one order, but when the order is swapped the meaning will change to become incorrect/bad/dangerous instead.

(As a side note, the plugs and sockets can change orientation, so "left" and "right" don't work as holding the thing upside down means left and right become opposite. There's also no room to write anything on the sockets, only on the plugs.)

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    How 'bout hell o and o hell? :D Commented Jan 11, 2017 at 8:21
  • This is off topic to the English Language Usage and not exactly what you are after but you could colour each socket and corresponding plug with different colours. For example the left plug and its socket can be coloured red and the other plug and socket could be coloured black. That way it will not matter about orientation. The correct socket will be matched with the correct plug Commented Jan 11, 2017 at 8:46
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    Not trying to push this away but I wonder if the puzzles stack exchange that might be helpful Commented Jan 11, 2017 at 9:01
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    Right way: ON. Wrong way: NO. Commented Jan 11, 2017 at 9:40
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    I'm voting to close this question as off-topic because this isn't a question expertise in English will help answer. It's a puzzle, a rebus. Commented Jan 11, 2017 at 15:13

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“O” and “K”.  In the right order, they spell “OK”; in the wrong order, they spell “KO”, which stands for “knock-out”.

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