There is no such thing as a tariff on exports. Tariffs are specifically an import tax intended to increase domestic demand for domestically produced goods by shifting it away from imported goods
That's correct, or at least it was until this week. Did you happen to see the recent announcement where NVidia and AMD are now apparently required to pay 15% of the revenue from GPUs exported to China to the U.S. government? This is apparently GPUs which were, prior to this new 15% payment, "too harmful to our national security" to export to China.
Frankly, I only saw the headlines and haven't looked into it myself yet - mostly because it makes my head hurt trying to even tally the laws, policies and trade agreements doing this would probably violate. So, I'm admittedly unclear on the details but it sure sounds like an "export tariff".
or we could describe it by its actual term, extortion. step 1) tell businesses they can no longer export X product because of "national security concerns"; 2) tell businesses the "national security concerns" can be dropped if they pay 15% of sales.
in other words, threaten to put up barriers than agree to take them down for a "fee"; it's exactly what the mafia does