Final answer:
A piece of rock from which flakes are removed is called a lithic core, used in creating stone tools through a process known as lithic reduction.
Step-by-step explanation:
A piece of rock from which flakes are removed is often referred to as a lithic core. This term is typically used in the context of stone tool production, where a piece of stone is shaped into a tool by striking it and removing flakes to create edges or points. This process is called lithic reduction. For example, the Solutrean tool industry created finely worked bifacial points through this technique. Essentially, a lithic core serves as the starting material that is methodically reduced by detaching flakes to achieve a desired shape, which can then be further refined into a usable tool.