Uncommon, it will definitely encounter it over time; related stock code: Berkshire Hathaway
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Some stock ticker symbols contain periods or other special characters in their names. When submitting these to Interactive Brokers (IB) via Fix, certain transformations of the stock code name are required.
BRK/B -> BRK B
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For the Fidelity Securities case, it’s possible to analyze and implement the conversion rules are fixed through coding. When the rules are not fixed, generally the system needs to store the corresponding mapping relationships, which are updated periodically by business operations personnel.
Reference Links
How do I enter the symbol for Berkshire Hathaway Class B shares onto TWS?