顺便提供几个网上看到的icon。。 #4
Description
可以下载，详细的item没仔细看，非商业用途应该是可以的吧。。。
https://www.flaticon.com/free-icon/exchange_330750#term=exchange&page=2&position=59
https://www.flaticon.com/free-icon/currency_747713#term=exchange&page=9&position=14
https://www.flaticon.com/free-icon/exchange_313210
https://www.flaticon.com/free-icon/currencies_721485#term=exchange&page=5&position=91
https://www.flaticon.com/free-icon/exchange_262383#term=exchange&page=6&position=15
https://www.flaticon.com/free-icon/currency_783229