The mean profit of winning trades, which is meaningless without the average loss and the win rate beside it.
Expectancy: the average trade. Forty trades sorted by outcome: 24 small losses and 16 larger wins. Weighting each side by how often it happens gives the average result per trade, marked here by the dashed line at +$120.
Average win is the sum of winning trade profits divided by the number of winners. Quoted alone it sells courses; quoted with its partners it does useful work.
Its most common distortion is the outlier. A record of 60 winners averaging $310 can be 59 trades near $180 and one at $8,000, which is a completely different strategy from one with a tight cluster of results. Always report the median alongside the mean, and check whether removing the single best trade changes the conclusion - see outlier-dependence.
In R units the figure becomes portable. An average win of plus 2.1R and an average loss of minus 0.95R gives a payoff-ratio of 2.2, which combines with win-rate to produce expectancy regardless of account size or instrument.