Yud key vav kay, or in each specific month, the correct permutation of those letters.
Another option is yud kay vav kay over the Aron hakodesh, between the kruvim. You can imagine yourself standing in the kodesh hakedoshim davening to Hashem.
You imagine these things with your mind, from your skull, called a kodkod. This is actually the roshei teivos of kodesh hakedoshim.
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