A slot is a thin opening or groove that can be used to hold something. For example, letters and postcards can be sent through mail slots in a post office. The term “slot” can also refer to a specific place on a testing machine where specimens are placed for each test run.

In slot games, a pay table is an essential guide that explains how winning combinations payout on the game and provides information on the more valuable symbols in the game. It also helps players understand what symbols can trigger bonus features and other side bets. Pay tables can be found on the exterior of a slot machine or integrated into a screen for video or online slots.

Traditionally, a pay table is a physical table with rows and columns that list the different combinations and their associated payouts. Usually, the highest payouts are listed at the top and decrease to lower combinations toward the bottom of the table. Today, many video and online slot machines do not use a physical pay table but instead display the results of their random number generator on screen.

An internal data structure for Compose that tracks groups, their keys, and remembered values. Groups may have children and maintain pointers to their parent, first child, and next sibling encoded as addresses pointing to a page and index within that page. Groups may share an address space with other slots in the same table, allowing efficient movement of groups between tables by pointer reassignment instead of memory copying.