Stacks

stacks n. pl.  2a : an orderly pile or heap. — Merriam-Webster

1. library. The rear or upper rooms of a research library where the bulk of a collection is shelved, traditionally closed to general browsing. The book lived in the locked stacks of the Bodleian.
2. software. The vertical stratum of technologies a system is built upon — language, framework, database, runtime — taken as a unit. They rewrote the whole stack in Rust.
3. pharma (informal). A combination of pharmacologically active substances taken together for synergistic effect, esp. in bodybuilding or nootropic regimens. a pre-workout stack of caffeine, beta-alanine, and citrulline.
4. cognitive. A personal collection of mental models, frameworks, or heuristics held in active memory and deployed across problems. a Munger-style latticework stack.
5. short (diner). A serving of 2 pancakes, as opposed to a full stack of 3. Two short stacks and a coffee, please.