Stigma
The stigma is the receptive surface of a flower's female reproductive structure where pollen can land and begin the process leading to fertilization. In a mango's bisexual flower, its condition and receptivity are part of successful reproduction. Seeing pollen on a flower does not prove that a compatible pollen tube has reached an ovule. The term is useful when understanding pollination, but ordinary growers usually gain more from protecting flower health and insect visitors than from attempting to inspect every tiny stigma.