Final answer:
A stock-keeping unit (SKU) is a single alphabetic character assigned by the inventory manager to distinguish between different products or variations of a product.
Step-by-step explanation:
A single alphabetic character assigned by the inventory manager is known as a stock-keeping unit (SKU).
An SKU is a unique identifier used to distinguish between different products or variations of a product. It is typically composed of letters and/or numbers and is used in inventory management systems to track and manage stock levels.
For example, let's say a store sells t-shirts in different sizes and colors. Each unique combination of size and color would be assigned a unique SKU to help the inventory manager keep track of how many of each variation are in stock.