How to type [ (Left square bracket)

What is the left square bracket for?

The left square bracket [ is mostly used in programming and editing:

• arrays and lists: colors = ["red", "green"] in Python or JavaScript;
• indexing: colors[0];
• Markdown links: [link text](https://example.com);
• regular expressions: [a-z] matches a lowercase letter;
• in editing, for insertions or omissions in a quotation: “She said [that] it was fine”, [sic], or […].

It always comes with its partner, Right square bracket ].

Pitfalls

• On this layout: [. On French – Numerical: ⌥ Option+⇧ Shift+(.
• Do not confuse it with the curly brace Left curly brace {, often on the same key with a different modifier.