If it was a wrathful practice, ” DZA HUNG BAM HO ” would represent the activity of the hook, noose, chain, and bell, but in the peaceful practice:

“DZA” signifies “summoning” – all the lights coming from the 3 places invoke the wisdom-deities to come into space before one;
“HUNG” means “remaining” or “residing” – the wisdom-deities, whom one has invited, and one’s own visualisation, the commitment-deities, are essentially the same: the essence of the mind of a buddha and of one’s own mind is emptiness and appearance inseparable;
“BAM” signifies “binding” – the wisdom-deities and one’s own commitment-deities become mixed with each other, like water into water;
“HO” means “pleased” – after the wisdom-deities and commitment-deities have blended, they feel great joy and happiness at being able to accomplish the benefit of beings.