Maths Dingbats are great for lesson starters and for using in quizzes – I’ve uploaded about 50 to this website here. These one all use some maths terms to generate the answer

There is a big powerpoint file with about 50 more here. These ones all give a maths related word as the answer.

and there are some great Pi-related Dingbats, here and here. A good resource for Pi Day and throughout the year.