In 1920, the name of the group was changed to the Retort, and on April 12, 1921, the club was reorganized as Pi Delta Nu, a professional fraternity for women in chemistry.

[1] The society was originally organized for women in chemistry but changed its scope to include girls interested in the fields of bacteriology, zoology, pre-medicine, and physical therapy.

[2] The first two editions of the Missouri Savitar yearbook that include the group list the society as "Pi Delta Nu and the Retort" may have evolved from a publication committee.

By 1935, this was replaced by a stylized pin in gold, consisting of two equilateral triangles pointing up and down and overlapping, with the raised Greek letters ΠΔΝ on a center band.

[1] The crest consists of a knight bearing upon his shoulder the balanced scale of justice and on his arm a shield upon which is a retort, a helix, a crucible, a scalpel, and an open book.