the.com/assembler

means A program (or person) that converts low-level, human-readable symbolic code into the exact machine instructions a processor executes.

from From 'assemble' — Latin assimulare/assimilare roots tangled with 'simul' (together) — via French, meaning to gather parts into a whole. In computing, the word was adopted in the 1950s for programs that gathered symbolic instructions ('ADD', 'MOV') and assembled them, one-to-one, into the raw binary opcodes a machine could run — the first rung on the ladder away from hand-toggled machine code.