SNOT (Studs Not On Top) is the term used for building with techniques to change the brick(s) direction.

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When did Lego decide that it was okay to put a stud into a technic hole?

At one point, Lego didn't really support putting a stud into a Technic hole, stating that it caused too much stress on the bricks. And for a while, there were no sets where that's the case. However, ...
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What is SNOT building?

I have seen reference on LEGO forums to "SNOT building". This sounds gross! Are there really squishy-sticky LEGO bricks, or what?