An instruction set is a list of all the instructions, and all their variations, that a processor can execute.

Set in stone 

Set (also spelled Seth, Sutekh or Seteh) the god of the desert, storms, and chaos.

either (one who) dazzles or pillar of stability, one connected to the desert

such as and, or, and not 
Data instructions such as move, input, output, load, and store 
Control flow instructions such as go to, if … go to, call, and return.

the empty set is the unique set having no (zero) members

Set down

the empty set exists by including an avatar of empty set;

Set aside 

Common notations for the empty set include “{},” “” and ““

For every element of ∅ the property holds (vacuous truth);

Set up 

closed-circuit/semi-closed circuit (also referred to as a rebreather). Here the diver breathes in from the set, and breathes back into the set where the exhaled gas is processed to make it fit to breathe again

Almost and to 
like you are just breathing your own exhalations (exultations) 

As a simple example, a union of two disjoint sets, which do not have elements in common results in a set containing only elements from both sets. 

Heart set