The progeny of a single homozygous self pollinated plant is known as

The progeny of a single homozygous self-pollinated plant is known as a pure line.
A pure line is an organism that always passes down certain phenotypic traits (i.e. physically expressed traits) to its offspring of many generations.
An organism is referred to as true breeding for each trait to which this applies, and the term "true breeding" is also used to describe individual genetic traits.