What does deal mean in tick by tick chart

In the context of tick charts, a deal refers to a transaction or a trade that is executed at a specific price. In a tick chart, each trade or transaction is represented by a small bar or a line, and the number of these bars or lines plotted on the chart determines the level of activity or the volume of trades executed. The term "deal" can be used interchangeably with "transaction" or "trade" in this context.