A [[Shinto]] ritual purification wand which resembles a [[gohei]] except with much more paper streamer decorations attached to a wooden staff or "sakaki":https://en.wikipedia.org/wiki/Cleyera_japonica branch (example Post #2587183). If the staff is hexagonal or octagonal it is a [[haraegushi]]. The oonusa is waved over the person, object or offering in order to transfer the sins and pollutions to it. 

h4. See also

* [[Gohei]]
* [[Haraegushi]]
* "Kokugakuin's Encyclopedia of Shinto":http://k-amc.kokugakuin.ac.jp/DM/detail.do?class_name=col_eos&data_id=22447 (External link) 
大幣 祓串