In applying to the NSF postdoctoral fellowship for mathematics, the instructions include the following paragraph for the biographical sketch:
A list of: (i) up to five products most closely related to the proposed project; and (ii) up to five other significant products, whether or not related to the proposed project. Acceptable products must be citable and accessible including but not limited to publications, data sets, software, patents, and copyrights. Unacceptable products are unpublished documents not yet submitted for publication, invited lectures, and additional lists of products. Only the list of 10 will be used in the review of the proposal.
My question is what exactly does "unpublished" mean? Is a paper uploaded to the arXiv but not yet submitted for publication in a journal considered "unpublished"?