Why is Andreessen Horowitz Called a16z? The Answer Was Hiding in Plain Sight.
Marc Andreessen has a long name.
This is not, on its own, a remarkable observation. But in the world of software engineering — where brevity is a religion and typing is a cost — a long name is a problem worth solving.
The solution, when it arrived, was elegant in the way that only obviously correct things are elegant. You take the first letter. You take the last letter. You count everything in between. You write the number.
A — ndreesse — n. Sixteen letters between the A and the z. a16z.
That is it. That is the whole answer.
The format has a name: numeronym. It exists because programmers are, at their core, people who automate the things they find tedious. Spelling out a long word repeatedly is tedious. So you compress it. The first practitioner of this particular compression was a DEC employee named Jan Scherpenhuizen, who, in 1985, started signing his emails S12n because his full name was too long to fit in a username field. Someone noticed. Someone else copied it. The pattern spread.
You probably use numeronyms without realising it.
i18n is internationalization — the i, eighteen letters, the n. l10n is localization. k8s is Kubernetes, which the container orchestration community apparently decided was also too long to type repeatedly in a terminal. The convention is now so embedded in tech culture that nobody stops to explain it. It is assumed knowledge. If you don't know what k8s means, you are new.
Andreessen Horowitz launched in 2009. Marc Andreessen and Ben Horowitz — two names, one firm, one problem: the name was unwieldy and the internet was fast. So they did what engineers do. They compressed it. a16z became the handle, the brand, the shorthand that every founder and every VC and every journalist who covers the space uses without thinking about it.
What nobody talks about is what happened next.
a16z didn't just adopt a clever abbreviation. They used it to build an identity that was deliberately different from every other venture firm. Traditional VCs had names like Sequoia, Kleiner Perkins, Benchmark — serious, institutional, slightly opaque. a16z sounded like a GitHub username. It sounded like something a developer would create. That was the point.
Marc Andreessen had written "Software Is Eating the World" in 2011. The thesis was that every industry would eventually be restructured by software. The brand said the same thing without saying it — we are not the old money in the room. We are the people who think in code.
The abbreviation was a signal before it was a brand.
There is a footnote to this story that almost nobody mentions. Ben Horowitz's name could also have been compressed — b6z, if you're counting. It was not. The firm did not become a16z-b6z, which would have been accurate but terrible. Marc Andreessen's name came first alphabetically, came first in the firm name, and came first in the abbreviation. Ben Horowitz built the firm with him and wrote the better book about it. The numeronym chose a winner without intending to.
Language always does.
The next time someone casually drops "a16z" into a conversation, you now know three things they probably don't. You know what a numeronym is. You know where the format came from. And you know that the most influential venture capital firm of the last fifteen years built part of its identity around the fact that one of its founders had a name that was annoying to type.
The devil is in the details. The details, in this case, were sixteen letters long.
