What Does the 'D' in Fe-D Modes Represent?

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Hello chemists,

One help..I read in some articles about Fe-H and Fe-D modes..
For eg., FeH6 means One Fe bonded to 6 H atoms...
But in Fe-D...'D' means what?

thanks
 
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Presumably, iron bonded to deuterium, but without context I can't be sure.
 

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