Similarity
🤷
Better be safe than sorry
Own at least 2 of the same model, factory, and HW revision
👫
"They're different, I swear!"
Own the same model of calculator from at least 3 different factories
DIY
⚒️
Hot rodder
Own a custom hardware variant (wooden TI-82, etc.), or have manufactured one
Quantity
🥉
Passionate
Own at least 10 calculators
🥈
reCALCitrant
Own at least 25 calculators
✌️
Twice as many as most people!
Own at least 2 calculators... it's a start!