I have my stones, I have my knives, question about sharpening angles--difference between total angle vs. angle of one side?

I have Tojiro DP knives, and some other various knives. I've read that for my Tojiro DP's, to go with 12degrees--but does that mean 12 on each side (total 24) or what? I've watched endless videos on techniques, and tried to read a lot, but this seems to be a point of fuzziness for me. I can't tell if something says "12 degrees" if it means total or per side :/ (dual bevel, obviously)