All or nothing is one of the possible generalizations of the biconditional
It means AND OR NOR:
    ∨ {\displaystyle ~\lor ~}           ⇔ {\displaystyle ~\Leftrightarrow ~}       
Apart from the line with no arguments it is the same as AND XOR NOR:
    ⊕ {\displaystyle ~\oplus ~}           ⇔ {\displaystyle ~\Leftrightarrow ~}       

 Image set Variadic Boolean functions (16×16 tables)
AND
OR
XAND
XOR
Own work
WatchduckYou can name the author as "T. Piesk", "Tilman Piesk" or "Watchduck".