Pretty sure it means brain, cerebral, or cerebrum!
1.firefighter 2.plumber 3. Electrician
4. Gardner 5.welder 6.pipe fitter 7.Mason
8. Fencer 9.blacksmith 10. Makeup artist 11.seamstress 12.painter 13.drafter 14.surveyor
15.butcher 16. Pastry chef
It goes 2 , 5, 3, 4 , 1 in order from top to bottom