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After the conclusion of the MLB season, the status of players on a club's MLB Reserve List (40-man roster) who are under contract for the following season is considered to be both "reserved" and "signed." The status of the other players on the 40-man roster are considered to be both "reserved" and "unsigned."
Unsigned players on an MLB club's Reserve List (40-man roster) would include any player who was added to an MLB Reserve List (40-man roster) after the conclusion of the MLB regular season, any player who can have his contract unilaterally renewed by his club, any player who is eligible for salary arbitration, and any player eligible to be an MLB free-agent per Article XX-B of the CBA.