These can result in crossness amongst mathematicians: everyone uses them on the blackboard (they are called blackboard-bold after all) but half use them in prin

These can result in crossness amongst mathematicians: everyone uses them on the blackboard (they are called blackboard-bold after all) but half use them in printed matter and the other half insist on actual bold. Discussions on the matter lead to cold stares and the poking of fingers in the chest.