“Three’s Company is an American sitcom television series that aired for eight seasons on ABC from March 15, 1977, to September 18, 1984. It is based on the British sitcom Man About the House.” –Wikipedia
In the TV show intro, the logo uses Viola Flare. Swashes are used for a number of the letters. Viola Flare is also used for the names of the cast members listed. Helvetica Bold is also used.