A slit or narrow opening in something, especially one for receiving coins, paper money, or letters. Also, the position or arrangement of a number of elements within an area, as in a computer chip. Also, the slot used to receive paper tickets with barcodes in a machine that pays out credits based on a combination of symbols.

A type of slot, found in casinos and other gambling establishments, in which a player inserts cash or, in “ticket-in, ticket-out” machines, paper tickets with barcodes that are scanned by a reader to register the winning combinations. The machine then spins reels and if the player has the right combination, it awards credit according to a pay table.

The slots on a computer chip that contain data needed to perform the instructions required by the operating system of the device. In some computers, these are called BIOS slots and are located on the motherboard or in a removable disk. In others, they are part of a PCI card or other expansion device.

Typically, each slot has a set of rules that determine how the data will be accessed and how it will be stored. Depending on the application, these rules may or may not be executed at each operation cycle. In general, the number of active slots is limited by the amount of memory available.

The ability to access and store data in a slot is governed by a set of rules that are stored in the memory of the computer or other device. The rules determine whether the data can be read or written to the slot and what functions the data can perform.

In airport coordination, a slot is an authorization to take off or land at a particular airport on a specific day during a given time period. This is to manage air traffic at busy airports and prevent repeated delays caused by too many planes trying to take off or land at the same time.

A specialized type of series slot, the periodic slot is used to hold data that repeats over a specified time period, such as monthly evaporation coefficients for a reservoir. This slot provides the same functionality as a normal series slot, such as display, flags, and use in SCTs but with additional features that are suited to a timeseries type of data.

The scalar slot is used to hold a single piece of numeric data that will not vary with time. This slot behaves like a normal series slot, with the exception that it can be docked onto a viewer and has its own Slot Dialog so that its expression or data can be edited. This slot also supports a number of additional features including dimensional analysis and the ability to use RPL (the same language in which RiverWare rules are written) to implement complex expressions, logic, and operations. The scalar slot also supports multiple input types (including string) and has both numeric and text column headings.