The name this entry carries is not the tradition's own, and the reason for the change is worth setting out plainly.
The classical terminology is masculine and feminine, and in the sources it is doing two jobs at once. It is a technical label for an alternating property of the signs, and it is a live piece of the period's gender thinking with the evaluations of that thinking attached. Ptolemy and his successors move between the two senses without marking the transition, and the resulting text reads very differently depending on which sense a reader supplies.
Modern astrology has substituted several alternatives. Positive and negative were common earlier in the twentieth century and have largely been dropped, because negative reads as a judgement rather than as a charge. Active and receptive, projective and magnetic, and yang and yin are all in current use. The atlas uses yang and yin, which is what the underlying data carries, and states here that they are a modern substitution for a classical pair.
The substitution has a cost as well as a benefit. Yang and yin are a genuine and central pair in Chinese cosmology, with their own long history, their own texts and their own technical uses in the Yijing, in medicine and in calendrics. Borrowing the words to relabel a Greek category invites a reader to assume the two systems describe the same thing, and whether they do is a question of comparative scholarship rather than a settled fact. The atlas holds the Chinese material under its own entries and does not treat the two as equivalent.
Sources The Contemporary Astrologer's HandbookSue Tompkins with A History of Western AstrologyNicholas Campion