Every tradable coin or token on an exchange is identified by a short alphanumeric code, its ticker, so traders can find and quote it quickly without typing out a full project name. Tickers are typically two to five characters (BTC, ETH, USDT) and are chosen by the project team itself rather than assigned by any regulator or central body, which is the root of most confusion around them.
Because there is no gatekeeper, the same ticker can end up attached to completely unrelated assets. A well-known case is Bitcoin Cash: it briefly traded as BCC on some venues before switching to BCH, since BCC was already used by the unrelated BitConnect token. Wrapped Bitcoin (wBTC) has also had impostors trading under the same or a near-identical symbol. Scammers exploit this deliberately, launching low-value tokens under a big project's ticker to trick careless buyers into sending funds to the wrong contract.
Traders reduce this risk by cross-checking a coin's contract address, its official website and, where possible, its listing page on a trusted exchange before placing an order, rather than trusting the ticker alone. Regulators and standards bodies have started addressing the gap: under the EU's MiCA framework, crypto-assets are increasingly tracked with the ISO 24165 Digital Token Identifier (DTI), a nine-character code intended to give every token a single, unambiguous reference the way an ISIN does for traditional securities.
Until such identifiers become universal, the ticker remains mainly a convenience label, useful for quick lookups on Bitcoin and other majors, but not proof of authenticity on its own.