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A single thickness of some material covering a surface.
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A (usually) horizontal deposit; a stratum.
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One of the items in a hierarchy.
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(computer graphics, by analogy to a stack of transparencies) One in a stack of (initially transparent) drawing surfaces that comprise an image; used to keep elements of an image separate so that they can be modified independently from one another.
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(networking) One of the seven network switch pieces in the Open Systems Interconnection model: application, presentation, session, transport, network, data link, and physical.
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(computing) An alternative keymap accessed through a modifier key or toggle.