m vs M in SI Units: Metre, Milli, and Mega Explained
Lowercase m can mean metre or milli depending on position; uppercase M means mega. Case and spacing are part of the SI expression.
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Symbol Comparisons
Enter vs Return: What’s the Difference?
Enter and Return are usually two names for the main confirmation key, but a keypad Enter can have a separate physical identity that software can detect.
Read more →Backspace ⌫ vs Delete ⌦: What’s the Difference?
In ordinary left-to-right text, Backspace deletes backward and forward Delete deletes ahead of the cursor. Apple keyboards complicate the naming by calling the delete-left key Delete.
Read more →Command ⌘ vs Control ⌃: What Do These Keyboard Symbols Mean?
Command ⌘ and Control ⌃ are separate modifier keys on a Mac. They sometimes correspond to familiar Windows shortcuts, but they are not interchangeable.
Read more →Option ⌥ vs Alt: Are They the Same Key?
Option ⌥ is the Mac modifier; on a Windows-style keyboard connected to a Mac, Alt commonly fills that role. The shortcut behavior still belongs to macOS and the…
Read more →Shift ⇧ vs Caps Lock ⇪: What’s the Difference?
Shift ⇧ is a temporary modifier; Caps Lock ⇪ changes a persistent keyboard state. Both can produce capital letters, but they behave very differently with symbols and shortcuts.
Read more →Equals = vs == vs ===: Why They Mean Different Things in Code
One, two, or three equals signs can mean very different things in source code. JavaScript makes the contrast especially visible with assignment, loose equality, and strict equality.
Read more →Ampersand & vs &&: What’s the Difference in Code?
In JavaScript, & works at the bit level while && is a short-circuiting logical operator. They are built from the same ampersand character but behave very differently.
Read more →Exclamation Mark ! vs !=: What Do They Mean in Code?
JavaScript uses ! for logical negation and != for loose inequality, while !== performs strict inequality. The mathematical ≠ sign is a different Unicode character.
Read more →Percent Sign %: Percentage, Remainder, or Modulo?
In 25%, % means per hundred; in source code it may be a remainder or modulo operator; in a URL such as %20 it begins percent-encoded byte notation.
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