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Header may refer to:
Header (information technology) , supplemental data at the beginning of a data block
Header file , a text file used in computer programming (especially in C or C++)
Page header , in printing or typography the material separated from the main body that appears at the top of a page
An exhaust manifold in automotive engineering
A headlong fall, particularly from a penny-farthing bicycle
The commonplace name for the lintel structural member in building construction.
Use of the player's head to direct the ball in association football (soccer)
A competitor in the team roping rodeo event who specializes in roping a steer's head
A herding dog with a specific method of interacting with its flock
Header (film) , a 2006 film
the head of a combine harvester