What it means
Exchanges assign symbols when a company lists. Some are abbreviations of the name, some are initials, and some are chosen for branding reasons.
A company can usually keep its symbol through its life, and a symbol that has been abandoned may later be reused by another company. Symbols differ between markets.
Many US exchanges use one to four letters, while other markets may use numbers, longer codes or a suffix showing the exchange. The same company listed on two exchanges can therefore have two different symbols, so the market must be named when you search.
Symbols are only part of the identification system. Professional systems also use international codes such as the ISIN (International Securities Identification Number), which is a unique twelve-character code for each security worldwide.
These codes avoid confusion when similar names or symbols exist. For business users, symbols matter in practice.
They appear on trading screens, in financial data feeds, in investor relations pages and in research reports. A wrong or misread symbol can lead to an order for the wrong company, which has happened with similar-looking codes and is a reason to confirm the company name before sending the order.
Symbols also change when companies merge, rename themselves or move to another exchange. Finance teams that load data into models and reports should keep a mapping table of symbols and permanent identifiers.
This stops history from breaking when a code changes. It also helps to know the common conventions.
Some symbols carry a suffix to show a share class, such as ordinary or preferred shares, and some markets add a letter to flag a special condition like a pending delisting. Reading these suffixes correctly avoids buying a different class of share from the one intended.
In practice
Real-world examples.
Example
A retail investor types a three-letter code into her broker's screen and sees a price for a company she has never heard of. She had meant a similar-looking code for a different business. Because the screen shows the full company name, she catches the error before placing the order.
Example
A finance analyst building a model downloads share prices from a data provider using symbols. The company changes its name and symbol mid-year, and part of the price history disappears from the data. He fixes the model by mapping both symbols to the company's permanent identifier.
Example
A dual-listed mining company trades under different symbols in New York and in London. A treasurer comparing prices checks that she is looking at the same class of share on each. She then converts currencies before comparing the two prices.
Case study
Seen in the real world.
Skyline Beverages is an illustrative, fictional company preparing to list on an exchange. The marketing team wants a symbol that spells a catchy word, but the exchange has already assigned it to another firm.
The finance director chooses a four-letter alternative based on the company's initials, and the investor relations team adds it to all presentations, the website and press releases. Two years later the company merges with a rival, and the symbol changes.
Because the finance team had kept a table of permanent identifiers alongside symbols, its reports and models continue to run without a break. The illustrative lesson is that symbols are convenient labels but can change, so records should rely on stable identifiers underneath. The finance team also added a short note to its procedures. Any new symbol must be recorded in the mapping table on the day it appears, together with the effective date and the old code, and the data team signs off the change. The step takes minutes and has since prevented several gaps in monthly reporting packs.
Watch out
Common mistakes.
- Assuming a symbol is the same on every exchange, when a company often trades under different codes in different markets.
- Relying on a symbol alone in data work, when symbols can change or be reused by other companies.
- Placing an order from memory without checking the company name on screen, which risks buying the wrong shares.
Questions
People also ask.
What is the difference between a stock symbol and a ticker?
They are two names for the same thing, the short code that identifies a listed security, and in everyday speech people use the words interchangeably. The word ticker comes from the old paper tape machines that printed prices as they changed.
Who chooses a company's symbol?
The company usually proposes one when it lists, and the exchange approves it or assigns another if the request is taken. The code belongs to the exchange rather than the company, which is why exchanges can reassign codes under their own rules.
Can a symbol change?
Yes, it can change after a merger, a rename or a move to another exchange, and the old code may later be reused.
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