The kanjo, also known as sannin-kanjo represent court ladies serving in the imperial court, and one of them has blackened teeth called ohaguro and shaved off their eyebrows (in general, a woman with blackened teeth and no eyebrows was married, but in the case of a court lady who remained single all her life, it is assumed that she was senior).
官女（三人官女）は宮中に仕える女官をあらわす、内1人のみお歯黒、眉無し（既婚者を意味するが、生涯独身の女官の場合には年長者という意味であろう）