What is the meaning of MB1, MB2, and MB3?

In some documents about the computer, you can see the MB1, MB2 and MB3 shortenings.

They define the mouse buttons.

MB1: (Mouse Button 1) Left Mouse Button

MB2: (Mouse Button 2) Middle Mouse Button

MB3: (Mouse Button 3) Right Mouse Button

In cad-tips.com, I use LMB, MMB, and RMB instead of these shortcuts.

LMB: Left Mouse Button

MMB: Middle Mouse Button

RMB: Right Mouse Button

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