> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tartini.com.br/llms.txt
> Use this file to discover all available pages before exploring further.
# The third tone
> Where the product's name comes from and the standard it sets for the brand's design.
export const Artigo = ({titulo, href, children}) => {titulo}
{children ? {children} : null}
;
export const Lista = ({titulo, children}) =>
{titulo ?
{titulo}
: null}
{children}
;
This is the Tartini brand manual: the symbol, the colors, the letters, the voice, and the measures of application. Each chapter covers what can be done, what cannot, and why.
***
## The name
Giuseppe Tartini, an 18th century violinist, discovered the third tone: play two correct notes at the same time and a third, lower note appears, one that neither string produced. Its pitch is the difference between the other two.
The product has two parts that need to be right at the same time: the people who provide support and the AI that works with them. That is where the name comes from, and that is the standard behind this manual: if the brand leaves any doubt about which of the two sides is speaking, the manager loses their judgment and the customer loses their reference point.
Canonical lockup: symbol at 34 pixels, 12 of breathing room, wordmark at 30.
***
## The phenomenon
The third tone works as proof because it amplifies error. A small deviation in the two notes on top becomes a large deviation in the note below, and anyone in the room can hear whether the two parts are in tune.
| Notes played | Third tone | What happens |
| ----------------- | ---------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
| 880 Hz + 1,100 Hz | 220 Hz | Pure interval. The third tone lands exactly two octaves below the first note. |
| 880 Hz + 1,109 Hz | 229 Hz | Nine hertz of deviation up top is worth about a seventh of a semitone. Down below, those same nine hertz are worth more than half a semitone. |
The error scales up as the pitch goes down: that is what makes the third tone usable as proof.
In the brand, each side has a color, and where the two meet has its own:
* **Terracotta**, #EB5E28: the people.
* **Cobalt**, #2667FF: the artificial intelligence.
* **Gradient** from terracotta to cobalt: where the two touch.
***
## The manual
Anatomy, fixed proportions, the five variants, minimum size, and lockup.Neutral base, the two signals, semantic states, dark theme, and screen ratio.The system's only authorized decorative use, with the list of what it can and cannot do.The three type families and their roles, the scale, and the wordmark.How the brand writes, the permitted vocabulary, the banned terms, and the AI signature.Grid, spacing, corners, borders, shadows, focus, buttons, density, and motion.The checklist that the rest of the manual exists to support.
## Related topics
- [Set the tone of voice](/en/cerebro/comunicacao.md)
- [The symbol](/en/marca/simbolo.md)
- [The gradient](/en/marca/gradiente.md)
Canonical lockup: symbol at 34 pixels, 12 of breathing room, wordmark at 30.
***
## The phenomenon
The third tone works as proof because it amplifies error. A small deviation in the two notes on top becomes a large deviation in the note below, and anyone in the room can hear whether the two parts are in tune.
| Notes played | Third tone | What happens |
| ----------------- | ---------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
| 880 Hz + 1,100 Hz | 220 Hz | Pure interval. The third tone lands exactly two octaves below the first note. |
| 880 Hz + 1,109 Hz | 229 Hz | Nine hertz of deviation up top is worth about a seventh of a semitone. Down below, those same nine hertz are worth more than half a semitone. |
The error scales up as the pitch goes down: that is what makes the third tone usable as proof.
In the brand, each side has a color, and where the two meet has its own:
* **Terracotta**, #EB5E28: the people.
* **Cobalt**, #2667FF: the artificial intelligence.
* **Gradient** from terracotta to cobalt: where the two touch.
***
## The manual