The term 'Bygone Auto Ornament' refers to the decorative features of classic automobiles from the early 20th century. The crossword solutions for this term include FIN (3 letters), FINS (4 letters), HOOD (4 letters), REO (3 letters), NASH (4 letters), and OLDS (4 letters), as well as EDSEL (5 letters). These are all names of car manufacturers from the era, and each of these companies had unique designs that set them apart from other cars of the time. For example, the REO was known for its distinctive grille, while the Nash had a unique HOOD ornament. The OLDS and EDSEL were also known for their distinct styling. All of these features were considered ornamental and helped to make these cars stand out from the crowd.