Inbound aircraft to London Heathrow Airport typically follow one of a number of Standard Terminal Arrival Routes (STARs). The STARs each terminate at one of four different RNAV waypoints (co-located with VOR navigational aids), and these also define four "stacks" where aircraft can be held, if necessary, until they are cleared to begin their approach to land.
Inbound aircraft to London Heathrow Airport typically follow one of a number of Standard Terminal Arrival Routes (STARs). The STARs each terminate at one of four different RNAV waypoints (co-located with VOR navigational aids), and these also define four "stacks" where aircraft can be held, if necessary, until they are cleared to begin their approach to land.
Source: Wikipedia "Heathrow arrival stacks" · CC BY-SA 4.0
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