Tick

Tick - The smallest price change (or quote update) in a currency’s price. Each tick represents a new bid and ask from the market. In high-frequency or precision backtests, cTrader can use raw tick data (every price change) to simulate trades. Spotware notes that cTrader provides “historical data of dozens of symbols… including raw tick data” for backtesting. In summary, a tick is a single price update; tick charts plot each one.