Final answer:
The partner described is known as a silent partner, who contributes financially but doesn't participate in the day-to-day management or decision-making in the business.
Step-by-step explanation:
A partner whose connection is concealed and has no voice nor say in the management of the affair of the partnership is called a silent partner. This type of partner contributes financially to the business but does not take part in daily operations or management decisions. Silent partners are different from other types of partners, like nominal partners, who may be named as partners but do not contribute to the business and have no management responsibilities, and dormant partners, who are similar to silent partners but may not be known to the public as part of the business.