Stack

Stack may refer to:

Science

Stack (mathematics), a sheaf that takes values in categories rather than sets
Stack (geology), a large vertical column of rock in the sea
Stacking (chemistry), or pi stacking, attractive, noncovalent interactions between aromatic rings

Stack (abstract data type), abstract data type and data structure based on the principle of last in first out
- Stack (C++), a C++ standard container, simulating a stack
Call stack, stack data structure that stores information about the active subroutines of a computer program
Stack-based memory allocation, a memory allocation scheme based on the principle of last in first out
Protocol stack, a particular software implementation of a computer networking protocol suite
Solution stack, a group of software systems, increasing in abstraction from bottom to top
Stack (Haskell), a tool to build Haskell projects and manage their dependencies
Stacks (Mac OS), a folder view on the Dock of macOS

Stack interchange, a free-flowing grade separated junction between two roads
- The Stack, the interchange of I-10 and I-17 in Phoenix, Arizona
Operation Stack, parking lorries on the M20 in Kent, England when Channel crossings are disrupted

Library stack, compactly spaced bookshelves in libraries
Amp stack, of guitar amplifiers
Smoke stack or chimney
- Flue-gas stack, the industrial terminology for an industrial plant chimney
- Funnel (ship), the smokestack or chimney on a ship
Stack magazine, a bimonthly publication about high school sports
Stack (unit), a US unit of volume for stacked firewood
Consonant stacking, a feature of some South Asian writing systems
Stacks (album), a 2005 album by Bernie Marsden