What does the slogan of the Atom text editor mean?

Question

atom

Hello, the question arose: what does the slogan of the Atom text editor mean?

A hackable text editor for the 21st Century

Namely, what does hackable mean? "Hackable"? "Changable"?

Answer 1

Rather the second. Amenable to fine tuning. The word hack originally meant not "hack", but something like "cut into", "deeply understand the topic."