Buoni ordinari del Tesoro, Bot, are the Italian government bonds, which are produced to finance public debt.
The bonds in question can be bought in a certain period of the year and can have different durations.
Bots are also bought by small investors, who at times manage to obtain even high interest rates thanks to these instruments. When Bot auctions take place, the markets are also very volatile.
In these situations, in fact, depending on the demand for Treasury bonds, the Stock market will move accordingly and with it also the currency.