Another fun tidbit related to this is that there were two prononciations of "ITS". The AI lab (where ITS originated) and the adjoining Project MAC slash LCS PDP-10s running ITS pronounced it as an acronym: "eye tee ess". But the Dynamic Modeling group (also in Project MAC), who were the first to adopt ITS outside the AI lab and had offices a few floors down, called it "its". I only learned about this recently when I talked to former DM people on video.