What number is slang for "I love you"?

What Does 143 Mean? The Sweet History Behind the Slang

Chances are you’ve seen "143" pop up in texts or social media captions—maybe even on a vintage-style sweatshirt or a retro-inspired tote. But what does it actually mean? 143 is old-school numerical slang for “I love you.”

The code breaks down like this: “I” has one letter, “love” has four, and “you” has three—hence, 143. It might sound like something straight out of a 90s chatroom, but its roots go even further back. Believe it or not, the term gained popularity in the 19th century. According to historical accounts, a Maine lighthouse keeper named Amos Stoddard reportedly used 143 to express his affection in diary entries. Later, it was even adopted by the US Coast Guard as a signal code for “I love you.”

Fast forward to the digital age, and 143 made a nostalgic comeback. Today, it's embraced by Gen Z and millennials alike as a quirky, heartfelt way to say those three big words—without actually saying them. On February 11, 2026, a special merchandise drop is even being released to celebrate the charm of 143, blending retro romance with modern flair.

So next time you want to send love in a low-key, slightly vintage way, try dropping a “143” in a text. It’s subtle, sweet, and surprisingly timeless. Cute? Absolutely. 😍