What do the three letters represent PLC?

Question

What do the three letters represent PLC which are on some documents? It's even om my laptop case.

Answer 1

program level change

Answer 2

programming logic controller

It's a digital computer used for automation of industrial processes, such as control of machinery on factory assembly lines. Unlike general-purpose computers, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact

Answer 3

Probably Longer Carrot

Answer 4

Public Limited Company?

Answer 5

Pressure Liquid Chromotography

No seriously, what your first answerer said.

Answer 6

Public limited company (one with shares listed on stock exchange)  - the opposite would be partnership/ privately owned company