Rudra Ratan

The image displays a framed Shree Kuber Yantra with a Kuber Mantra inscribed on it, designed to attract wealth and prosperity. 
Kuber Yantra: The golden key-shaped emblem with geometric patterns is a Kuber Yantra, believed to be a powerful tool for attracting wealth and abundance. 
Kuber Mantra: The mantra inscribed on the frame is "ॐ यक्षाय कुबेराय वैश्रवणाय धनधान्याधिपतये धनधान्यसमृद्धिं मे देहि दापय स्वाहा" (Om Yakshaya Kuberaya Vaishravanaya Dhanadhanyadhipataye Dhanadhanyasamriddhim Me Dehi Dapaya Swaha). 
Meaning: This mantra invokes Lord Kuber, the deity of wealth, and requests him to bestow wealth and prosperity upon the devotee. 
Usage: Such frames are often placed in homes or workplaces for spiritual and financial well-being, as per Vastu principles.