This incredibly detailed commission by Wolnir ( https://www.furaffinity.net/user/wolnir/ ) shows me "at work", while I was working in a large scientific computing center.

In addition to the important message on the T-Shirt, each sticker on the notebook belongs to one of my favourite tools or is a joke/statement.

0) T-Shirt label: "Legalize Awoo" AWOOOOOOooooo
1) Dragon sticker: Clang/LLVM (clang wasn't even released when I was working there, but since it's my favorite compiler now, I wanted to include it here)
2) "g" sticker: Gentoo Linux Distribution
3) Blowfish sticker: OpenSSH
4) "Fight for Net Neutrality" sticker: Keeping the net free from outside influence, large scale deep packet inspection, selective throttling and surveillance is very important to me
5) Shark sticker: The wireshark network diagnosis is a useful tool for debugging - but like every tool it can be misused by ethically challenged people
6) git sticker: git was brand new when I worked there, so I still had to use svn and cvs back then - fortunately that's no longer the case :D
7) python sticker: The BEST scripting language there is - and together with 10) it is a perfect team to tackle almost any kind of problem
8) "strange" collection of symbols: This is a reference to my favourite linux shell bash ... and I'll let you figure out what that command does :D
9) "home": There is no place like 127.0.0.1 - a nice little reference to the saying "There is no place like home"...
10) C++ sticker: just a nice reference to my favourite, compiled programming language C++(17) - and works wonderfully together with 7)
11) mc sticker: This is the logo of the awesome program "midnight commander" - a command line file manager with many, many useful features, that I use all the time

PS: I explicitly did not want to put a sticker about controversial topics like the big editor wars or the great space-vs-tabs debate on it ... although I have strong opinions in both cases :D