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Source:http://dota2.gamepedia.com/Trap
Trap is a type of disable that completely or partially surrounds a unit with immobile objects or restricts their movement in such a way that they cannot escape. Traps do not prevent any actions, such as attacking or using abilities and items, from being performed.
The following abilities are traps:

Clockwerk - Power Cogs Duration: 5/6/7/8 Creates a square of eight cogs. Cogs can be destroyed in three attacks, though Clockwerk can destroy them with one. The cogs are treated as wards (structures).	Disruptor - Kinetic Field Duration: 2.5/3/3.5/4 Creates an indestructible circular barrier of 300-unit radius that enemies cannot walk in or out of. The field does not affect units under the effect of magic immunity.
Earthshaker - Fissure Duration: 8 Creates a ridge 1400 units long.	Nature's Prophet - Sprout Duration: 3/3.75/4.5/5.25 Creates a ring of eight trees that can be destroyed by any item or ability that destroys trees, such as Quelling Blade and Nature's Call.
Shadow Shaman - Mass Serpent Ward Duration: 45 Creates a ring of ten serpent wards that have 135/150/150 health and magic immunity. The trap can be escaped with any ability that gives unitwalking, such as Shukuchi or Phase Boots.	Slark - Pounce Duration: 3.5 Prevents the target unit from moving 325 units away from the point of impact.
Tusk - Ice Shards Duration: 5 Creates a semi-circle of five indestructible ice shards facing the direction the spell was cast.