If Chemistry and/or Biology is your passion and you're eager to showcase it without saying a word, then look no further – this pin is tailor-made for you! It features an endearing mole perched inside a beaker, with Avogadro's constant displayed below. It's a clever nod to chemistry enthusiasts, as the Avogadro constant represents the number of particles, typically atoms or molecules, present in one mole of a substance. holders, etc.,. This lapel pin can be used on jackets, backpacks, bags, scarves, purses, hats, sweaters, lanyards, or badge reel.