LDLiEU #2

Today's LDLiEU is a less common phrase, although the loss of the literal meaning is nonetheless tragic; firewall. Literally, it refers to a colossal and insurmountable wall of flames, erected to protect some place or asset. In today's everyday use, it most commonly refers to a system of  computer security protocols, which can be reduced to a series of 1's and 0's.

Clearly there are some delusions of grandeur.