Taken from St. Nicholas OCA parish website in Florida:
DO YOU OWN A BUSINESS? ARE YOU WORKING IN A BUSINESS? If you are looking to do better in business, to expand, or grow, consider ST. PARASKEVA. In Greek ‘Paraskeva’ means Friday. During the days of the Early Church, all business profits were counted up on Fridays. All meaningful business transactions were made on Fridays. Consequently, St. Paraskeva became the patron saint of business, business owners, workers, sales people, professionals.