30 Days or 30d stands for data collected for a 1-month period, usually from the previous 30 days.
Cryptocurrency exchanges and charting platforms will use 30d to show you data from the last 30 days.
Using charts or collecting data like historical price movements over a longer time frame offers deeper insight into an asset’s trend when compared to smaller sample sizes of data or shorter windows of time like daily or weekly.
Longer time frames, such as 30 Days may also help you to identify patterns that don’t exist on lower or shorter time frames.
In crypto trading, certain digital asset performance metrics are also analyzed or compared over a period of 30 days, such as open and closing prices, volume and indicator data.