an exchange rate that is not fixed but is determined by supply and demand in the foreign exchange market

slave ships; specifically refers to the horrific conditions on ships used during the Atlantic slave trade

Wage or salary that is not fixed, where the total amount or a portion of it fluctuates based on the economic performance of the employer or the individual contribution of the worker.

a graphical user interface element that stays on top of other windows or moves independently within an application

a submersible structure used for raising a ship out of the water for repairs or maintenance