TIL the study and collection of postcards is called deltiology. The term was coined in 1945 from the Greek word "deltion", meaning "small illustrated tablet or card".

https://en.wikipedia.org/wiki/Deltiology
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1gq5oso/til_the_study_and_collection_of_postcards_is/