It's traditional for those on pilgrimage to Huashan to purchase a padlock, have it engraved with a personal message, lock it to a rail, and then throw the key off of the mountain. In this way, ones aspiration is symbolically "locked into" the mountain.

Visiting Feng-Hsien Temple At Lung-Men

I leave the temple, but stay another
night nearby. The dark valley all empty
music, moonlight scatters lucid
shadow among trees. Heaven's Gap

cradles planets and stars. I sleep
among clouds - and stirring, my clothes
cold, hear the first bell sound
morning for those waking that deeply.

- Tu Fu (translated by David Hinton)

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