The term 'A Sign of the Times' can be summarized by the crossword solution 'NEON'. NEON signs are a type of electric sign that use NEON gas-discharge lighting to create bright, colorful displays. They were first developed in the early 20th century and have since become a popular form of advertising and decoration. NEON signs are often associated with the 1950s and 1960s, when they were used to advertise businesses, restaurants, and other establishments. Today, they are still used for advertising and decoration, but they also have a nostalgic appeal that makes them popular among collectors.