describe the meanings of meaninglessness in the actions of the characters
Your question goes way beyond mere symbolism - it goes to the heart of existentialism itself. I would suggest reading through the analysis of the study guide posted here for a few explanations of the play.
Much of the meaninglessness is tied to the fact that the characters are in a hopeless state, and therefore are just trying to pass the time. Attempting to find any meaning the in the actions, other than as a time-waster, is precisely Beckett's point.
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i'd say more, absurdism
although existentialism and absurdism parallel each other in many ways.
