Two terms

A Unicorn: a series of checks by the queen alone which results in a perpetual check and a draw.

A Samson: The consecutive taking of two rooks ( Preferrably on their original square ) by one enemy piece( most probably a queen or a rook.) In the biblical account of Samson, we have:

³ But Samson lay there only until the middle of the night. Then he got up and took hold of the doors of the city gate, together with the two posts, and tore them loose, bar and all. He lifted them to his shoulders and carried them to the top of the hill that faces Hebron.

^{( The Book of Judges )}

 The Vivaldi Mate : A checkmate in which exactly a rook,a knight,a bishop and a queen are involved at the moment of mate. One of my recent posts demonstrates such a mating pattern: 

https://www.chess.com/forum/view/game-showcase/in-memory-of-vivaldi

Bullet and Blitz:  I know these terms apply to time control, but I have not been able to find their definitions. Would someone please enlighten me?