Using the example in the documentation: handcalcs.set_option("custom_symbols", {"star": "^*", "C": ","}) Mstar_1C2 renders as <img width="117" height="45" alt="Image" src="https://github.com/user-attachments/assets/00586bdd-2838-4de6-aff2-62e7d3ca40b6" /> Only without the star does the comma render as desired: M_1C2 = 5 <img width="108" height="45" alt="Image" src="https://github.com/user-attachments/assets/63560da1-696c-4681-b86c-db1e68eab189" />