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The name currently in use is a fan designator; see below for more information.
An entry hazard is any battlefield effect that affects the opponent's Pokémon as they are sent out of their Poké Ball. Any Pokémon already on the battlefield when these effects begin will be unaffected. All moves that create entry hazards are status moves.
Entry hazards are removed by Rapid Spin (user's side) and Defog (Generation VI: both sides; Generation IV-V: only opponent's side). In addition, Toxic Spikes is removed by a grounded Poison-type Pokémon upon switching in. Entry hazards will not trigger for support trainers joining the battle in Pokemon: Let's Go, Pikachu! and Let's Go, Eevee!
The following moves create entry hazards of various types: