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it's the deuterium hydroxonium ion.
you get it when you acidify deuteriated water.
not very cheap.
cheers!
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dh2o is distilled water.
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If you honestly didn't know this, you could've used Google or any dictionary or encylopedia. Or even read the sticky threads, which would've led you here:
http://www.chemfinder.com (http://www.chemfinder.com)
If these facts didn't occur to you, perhaps you should rethink involving yourself with matters such as the type discussed here.
(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_docs/000426710-file_jtjs.gif)