In the field of funds, the symbol "+"represents the increase of funds. When investors want to increase their share in a fund, they will choose to increase the capital of the fund, that is, use the newly increased funds to buy the share of the fund. At this time, the "+"symbol will be used to indicate the operation.

The "-"indicates the decrease of funds. When investors need to withdraw funds from a fund, they will choose to reduce their capital, that is, reduce their share in the fund, so as to realize the withdrawal of funds. At this point, the'-'symbol will be used to represent the operation.

The addition and subtraction symbols of funds are very common in fund transactions. In this way, investors can adjust their allocation of funds in different funds, thus optimizing their investment portfolio. In practice, investors need to flexibly use the addition and subtraction symbols of funds according to market changes and their investment objectives in order to obtain better investment returns.