A re-can is a roll of film stock which was originally opened up from a factory-sealed can and loaded into a camera magazine by a clapper loader, but remained unshot and thus was unloaded back into a film can unused.
Re-cans are considered distinct from new rolls because they may have been subject to environmental conditions since leaving their originally sealed can and are no longer under factory warranty, and are generally identified distinctly to avoid any confusion in the matter.
Assuming proper storage and fast turnaround time, they are considered perfectly usable.
Older re-cans or ones of uncertain provenance should be clip tested first to check their condition.
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