In 1997, to commemorate their 50th anniversary season, they introduced another new logo which featured a Celtic-style “B” inside three overlapping circles containing images related to Irish culture: A harp (music), four-leaf clover (luck), and shillelagh (strength), particularly in relation to the Boston Celtics Alternate logo. The center circle also contained five stars signifying all 16 championships won by that point as well as future success for generations to come. This is still considered one of the most recognizable logos across all sports today due to its unique design elements combined with historical significance tied into it making this classic look timeless even almost 25 years later!

Today’s primary logo continues where 1997 left off but updates some aspects such as replacing four leaf clovers with shamrocks along with adding shading effects behind them while keeping the overall shape the same; additionally adding an additional star underneath B symbolizes the 18th championship win during the 2008 season bringing the total number up current 19 titles - highest among any professional sports organization United States! As we can see through an evolution these various designs have stayed the true essence of what makes the Celtics so special & beloved not only by fans but the entire league itself – something that will likely continue to remain the case long into the future regardless if there are other changes made down line or not.