I've had a few more conversations with folks who found using the word glue a bit confusing. Partially because it is the same verb as the one to "glue a variable into a notebook".

One suggestion from @rowanc1, which I thought was pretty reasonable, was to just use the word var:. That way it is clear you're referring to a variable's contents. E.g. var:figure, var:string etc.

@chrisjsewell I feel like this is closer to your original idea of using nb:. What do you think about this?

(apologies for bringing up the naming again, but I think as we get clear user feedback in the early days we should incorporate it quickly...we definitely shouldn't be changing the user-facing API after folks really start using the tools, so better to get it right sooner)