A human being, mankind generically — not specifically male (that is anēr). Anthrōpos is the general term for humanity: 'the Son of Man' (ho huios tou anthrōpou) means 'the Human One.' It appears over 550 times in the NT, making it one of the most common nouns.
The title 'Son of Man' (huios tou anthrōpou) is Jesus' favorite self-designation, drawn from Daniel 7:13. It affirms both His full humanity and His divine authority. Paul contrasts two anthrōpoi: Adam the first man brought death; Christ the last Adam brings life (1 Corinthians 15:45). The incarnation is God becoming anthrōpos — human nature assumed and redeemed.