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Does each language have "lefty loosey righty tighty"?
(lemmy.world)
The world has a lot of different standards for a lot of things, but I have never heard of a place with the default screw thread direction being opposite.
So does each language have a fun mnemonic?
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"Lefty Loosey righty tighty"
One arrow points up to the left, one points down to the left.
It's about direction of rotation, does the wrench turn left or turn right, there isn't the same notion of up and down / in and out because that portion happens when the bolt or nut turns. Also, anything rotation is moving the opposite direction on the other side of the rotation, so if you have to tighten a screw that turns towards you it's the opposite