Bell Pepper, can you guess why it has that name??
Just a little history:
While the bell pepper is a member of the Capsicum genus, it is the only Capsicum that does not produce capsaicin, a lipophilic chemical that can cause a strong burning sensation when it comes in contact with mucous membranes. The lack of capsaicin in bell peppers is due to a recessive form of a gene that eliminates capsaicin and, consequently, the "hot" taste usually associated with the rest of the Capsicum genus.
The terms "bell pepper", "pepper" are often used for any of the large bell shaped fruits, regardless of their color.