A ticker symbol is the short code that identifies a security or cryptocurrency on an exchange — AAPL for Apple, MSFT for Microsoft, BTC for Bitcoin. It is a compact, unambiguous shorthand that replaces a full company or project name in quotes, charts and order screens.
Tickers are assigned within each market, so the same symbol can in principle refer to different things on different exchanges, and a crypto ticker is not guaranteed to be unique across the thousands of tokens in existence. Context — which market you are on — matters.
Confusingly similar tickers are a genuine source of error, with investors occasionally buying the wrong asset entirely. Always confirm that a ticker maps to the specific company or coin you intend before trading.
Worked example
AAPL identifies Apple's shares, while BTC identifies Bitcoin — each a short stand-in for the full name.
This definition is general education, not investment advice. Markets — especially crypto — are volatile and you can lose money. Please read our disclaimer and see our methodology.