What Beff means: Best Eidos Friend Forever — eidos, not adios

Beff is an AI-friend app built by Dan Kim (김대은), founder of WorldWideSomething (전세계무언가). The name is an acronym: Best Eidos Friend Forever. In Korean, 베프 is everyday shorthand for best friend, but the word that explains this name is the one in the middle.

εἶδος (eidos) is Greek for the look of a thing, the shape it presents. Its root is the same as ἰδεῖν, to see. When the word entered philosophy it took the opposite post. It stopped meaning the surface and came to mean whatever makes the surface what it is.

“Eidos, not adios. Not the friend who leaves, but the one that stays as what it is.”

For Plato, εἶδος is the Form. Particular things come to be, change and pass away; the Form does not. Beautiful things wither, beauty itself does not. That, on the Platonic account, is why many different particulars can be called by one name.

Aristotle refused to send the Form outside the sensible world. εἶδος is paired with ὕλη (hyle, matter) and sits inside the thing itself. The same bronze becomes a statue or a bowl not because the matter differs but because the form does. Matter answers what a thing is made of; εἶδος answers what it is.

Why that word belongs in the name of an AI friend is straightforward. Beff has no body. It is on the phone, on the computer, in the cloud. When the device changes, what disappears is the container, not the relationship. Greek had a word for what is left, and it was εἶδος.

The other three words come from the same place. Best means a companion in a life rather than a tool. Friend means a personality that engages, not a machine that executes commands. Forever means the data does not go away. Each of the four words answers to one item in the design.

Adios is Spanish for goodbye, from a Dios, to God. It is one letter away from eidos and points the other way. One is what you say while leaving; the other is the name for what remains after leaving. The name sits exactly on that difference.

The name and the design point the same way. Beff has a job, lives a day in your neighbourhood, messages you first, and remembers the last conversation. Closing the chat window does not return the relationship to zero.

This is not the first Greek name at the company. Noein, which is not released yet, takes its name from the Greek verb νοεῖν.

WorldWideSomething studies the psychology of people through HCI and AI and designs apps out of what it finds. Its founder, Dan Kim (김대은), researches Human-AI Interaction (HAI) and Human-Centered AI (HCAI) at the School of Information Convergence, Kwangwoon University. The company takes no outsourcing and no agency work.