po·si·tion·er

[puh-zish-uh-ner]
noun
1.
a person or thing that positions.
2.
Orthodontics. a removable device of resilient plastic material worn in the mouth usually during sleep to produce minor adjustments in the position of teeth after straightening appliances have been taken off.

Origin:
1930–35; position + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
positioner

noun
(computer science) the actuator that moves a read/write head to the proper data track [syn: rotary actuator
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Positioner is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Example sentences
The electron pulse is to the right of the target positioner, which is near the
  center of the image.
It was heavy on that end and the positioner was placed so that any additional
  weight on that end would easily cause it to tip.
The diamond anvil cell will be mounted to the target positioner as shown in the
  upper right sketch.
As workers fill a pallet, the top of the positioner can be adjusted so that the
  work height remains at an optimum level.
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