What’s my favorite screw?

It’s a M3 (0.5mm pitch) x 12mm stainless steel socket head

My first real mechatronics project was, in 2014, putting together a RepRap Prusa I3 from components from hardware stores and ordered from Amazon. I ordered a 100pk of these screws from McMaster (catalog# 91292A114) and have been using them ever since.