The term static differentiates SRAM from DRAM (dynamic random-access memory) which must be periodically refreshed. SRAM is faster and more expensive than DRAM; it is typically used for CPU cache while DRAM is used for a computer's main memory. 1 Applications and uses 1.1 Characteristics 1.1.1 Clock rate and power.
A biological key is a list of questions that can categorize the items.
This is not how the term is used within the context of sleep medicine, however. Instead, the biological clock refers to the body's ability to time innate processes to the external environment, most notably the timing of light and darkness, temperature, and resource accessibility.