Receptacle mating pin, receptacle connector, and board-to-board connector assembly including same

A receptacle mating pin for a receptacle connector according to an embodiment of the present disclosure comprises: a first reinforcing portion; a pair of second reinforcement portions disposed perpendicular to the first reinforcement portion; a bottom reinforcement portion connected to the first reinforcement portion; and an island reinforcement portion connected to the bottom reinforcement portion, where the pair of second reinforcement portions includes a second upper cover portion continuously connected to and extending from both sides of the first upper cover portion of the first reinforcement portion, and a curved inner angle covering portion is provided between the first upper covering portion and the pair of second upper covering portions. 根据本公开的实施方案的用于插座连接器的插座配合钉包括：第一增强部分；一对第二增强部分，该对第二增强部分垂直于该第一增强部分设置；底部增强部分，该底部增强部分连接到该第一增强部分；和岛增强部分，该岛增强部分连接到该底部增强部分，其中该对第二增强部分包括第二上覆盖部分，该第二上覆盖部分连续地连接到该第一增强部分的第一上覆盖部分的两侧并且从该两侧延伸，并且弯曲内角覆盖部分设置在该第一上覆盖部分和该对第二上覆盖部分之间。