Using Set terminal – See code in one of the variables. What is it?

When I type set on terminal I see the following. there is code running to a few pages.
Wondering what this is and how to get rid of it.

XDG_SESSION_TYPE=x11
XMODIFIERS=@im=ibus
_=go
__git_printf_supports_v=yes
_backup_glob='@(#*#|*@(~|.@(bak|orig|rej|swp|dpkg*|rpm@(orig|new|save))))'
_xspecs=((lokalize)="!*.po" (acroread)="!*.(pf)df" (lbzcat)="!*.?(t)bz?(2)"

Full code list :
https://pastebin.com/WDWyrKmJ