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## Main Question or Discussion Point

I'm reading a journal article at the moment which uses a piece of notation which they dont actually define. It looks like this:

[tex]\nabla_{\vec Q}[/tex]

(As it happens, [tex]\vec Q[/tex] is an ordinary vector indicating the orientation of a polymer.)

I've never seen vector subscript on the gradient symbol "[tex]\nabla[/tex]" before.

Could anyone please tell me what [tex]\nabla[/tex] with a vector subscript usually means?

[tex]\nabla_{\vec Q}[/tex]

(As it happens, [tex]\vec Q[/tex] is an ordinary vector indicating the orientation of a polymer.)

I've never seen vector subscript on the gradient symbol "[tex]\nabla[/tex]" before.

Could anyone please tell me what [tex]\nabla[/tex] with a vector subscript usually means?