What is the meaning of the four-letter codes after the passenger name/status/CIV etc on the flight manifest?

I happened to be standing near the manifest today, and I noticed it the for the first time. The format goes something like this, below, where ABCD is the code I'm asking about: SEAT - SURNAME/NAME - *** GOLD CLUB MEMBER *** - [CIV]/ABCD

Is it the meal requested or something related to food?

Thanks!