This has an opening called the apical foramen. 
Definitions:
Trade Discount
A reduction in the list price granted by a seller to a buyer based on the volume of the transaction or the buyer's trade status.
Catalog List Price
The official selling price of a product as listed in a catalog, before any discounts or promotions are applied.
Credit Terms
The conditions under which a seller extends credit to a buyer, including payment deadlines, interest rates, and discounts for early payments.
Invoice Discount
A reduction in the billed price granted to customers, often used as an incentive for early payment.
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