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I belive what your asking about is when two Vulcans "touch" their index and middle fingers together. 

To do this you'd place your index and middle finger together on your dominant hand while folding your other fingers in, you would then caress the other persons two fingers.

It's sweet and innocent yet is also very intamite and sexy.

You can find and example in this fanfiction piece - The preceding unsigned comment was added by (talk).

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