Any mechanical device used to position something(noun)
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Use "positioner" in a sentence
"On Webb - He and Ford are refreshing Democrats, with Webb far more authentic in being a true national security Democrat like Scoop Jackson and Sam Nunn than Ford, who is more a "positioner" trying to appeal to a more conservative audience than he would face in Blue States."
"U.S. Consumer Product Safety Commission One style of sleep positioner has an inclined mat with side bolsters."
"But the Consumer Product Safety Commission and the Food and Drug Administration said they've received 12 reports of deaths over the past 13 years involving babies who have suffocated in a sleep positioner or became trapped and suffocated between a sleep positioner and the side of a crib or bassinet."