I'm trying to describe the phenomenon behind dates like March 21st being Down Syndrome awareness day (signifying 3 chromosome 21's); July 10th being dab day among cannabis enthusists (upsidedown it spells OIL); March 14th being Pi day because it resembles 3.14.
A pun isn't exactly right, though I'd say May the 4th (may the force...) being Starwars Day is a pun. Numerology isn't exactly right either, as the definition has to do with magic. I mean more like the numbers are symbolic. I'm sure there are other examples I can't think of.
Is there a specific word for this other than simply "symbolism"?