Can You Register Numbers, Letters, or Dates as Trademarks in Brazil?
Brazilian law bars isolated numbers, letters, and dates from trademark registration — unless they're sufficiently distinctive. Learn exactly what INPI requires, when secondary meaning applies,
Laila dos Reis Araujo
5/7/20266 min read
Your brand is built around a number. A single letter. A founding date. It works everywhere else, but Brazil is rejecting the application. Here is why, and what you can actually do about it.
The Rule: Isolation Is the Problem
Brazil's Industrial Property Law (Law No. 9,279/1996) contains a clear prohibition in Article 124, item II: isolated letters, numerals, and dates cannot be registered as trademarks unless they possess sufficient distinctive character.
Note what the rule targets: isolation. A number on its own. A letter on its own. A date on its own. The moment you combine any of these with stylization, a design element, a word, or another sign that creates a distinctive whole, you move out of the prohibited zone and into ordinary trademark analysis.
This matters practically. "7" filed as a plain word mark is almost certainly going to be refused. "7" presented in a distinctive stylized logo may register without any problem. "B" alone is unregistrable. "B" inside a graphic element with proprietary design is a different application entirely.
The policy rationale is straightforward: numbers, letters, and dates are the basic building blocks of communication and commerce. Granting exclusive rights over them in isolation would give one company a monopoly over something every other market participant needs to use. Brazilian trademark law draws the line there, while still leaving a path open for marks that have genuinely become distinctive.
Three Categories, Three Analyses
The legal issues differ depending on whether you are dealing with a number, a letter, or a date. INPI does not treat them identically.
Numbers
Isolated numerals face the toughest scrutiny because they are almost always perceived as descriptive: a product model, a variant, a size, a quantity, a ranking. "5" for a product line reads as a model designation, not a brand identifier. "24" for a delivery service reads as a reference to hours, not a company name.
The question INPI will ask is whether the numeral, in the specific context of the goods or services claimed, functions as a source identifier rather than a descriptor. If consumers see the number and think "that company's product," you have a trademark argument. If they see it and think "that kind of product" or "that specification," you do not.
Numbers that have achieved registration in Brazil typically did so either through distinctive stylization or, in the case of well-known marks like "51" in the cachaça sector or "4711" in fragrances, through decades of use that built strong secondary meaning among consumers.
Single Letters
A single letter faces the same isolation problem as a number, amplified by the fact that single letters are widely used as abbreviations across industries. "F" could refer to any company whose name begins with F. "M" is used across sectors from automotive to food to finance.
That said, INPI has registered single-letter marks where the application was filed as a design mark with distinctive stylization, or where the letter had acquired clear secondary meaning through long-term exclusive use. The letter alone, as a plain word mark, will almost always receive an office action.
Dates
Dates are the most contextually sensitive category. A date that references the founding year of the business, a historical event, or a product launch reads as informational, not as a brand identifier. "1891" for a heritage brand tells consumers when the company was founded. That is descriptive, not distinctive.
The exception arises when a date is so consistently and exclusively associated with a specific brand that the consuming public no longer decodes it as a calendar reference but reads it as a mark. This is rare, and proving it requires substantial evidence. The stronger practical route is to integrate the date into a broader mark, such as a logo or compound sign, where it contributes to a distinctive whole rather than standing alone.
When Registration Is Possible: Inherent vs. Acquired Distinctiveness
Brazilian trademark law recognizes two paths to registrability for signs that would otherwise be barred by Article 124, item II.
Inherent distinctiveness exists when the sign is presented in a way that is arbitrary, fanciful, or so stylized that it functions as a unique identifier independent of any descriptive meaning. A highly stylized "3" with proprietary graphic treatment may have inherent distinctiveness as a design mark. The distinctiveness, in this case, comes not from the numeral itself but from how it is visually expressed.
Acquired distinctiveness, also called secondary meaning in international trademark practice, arises when a sign that started without inherent distinctiveness has become so closely associated with a specific company, through extensive and exclusive use in the market, that the relevant public recognizes it as a brand identifier rather than a generic element.
Until 2025, proving secondary meaning before INPI was practically impossible at the administrative level. The office consistently refused such arguments, leaving brand owners with no real option other than litigation: a slow and expensive route that few pursued successfully.
Ordinance 15/2025: The Rule Change That Matters
In June 2025, INPI published Ordinance No. 15/2025, which took effect on November 28, 2025. For the first time, Brazil now has a formal administrative procedure for recognizing acquired distinctiveness without requiring a court decision.
Under the new framework, a brand owner can request recognition of secondary meaning if two conditions are met: the sign has been used substantially and continuously for at least three years prior to the request, and a significant portion of the relevant public recognizes it as a trademark identifying the origin of the goods or services.
The request must be supported by documentary evidence. INPI will look for a combination of the following: market research or consumer surveys demonstrating brand recognition; advertising materials showing consistent investment in the mark over time; press coverage and third-party references; sales figures and market share data; and evidence of exclusive use of the sign in connection with the relevant goods or services.
The recognition can be requested at multiple stages of the administrative process: at filing, in response to an office action, or in response to an opposition or nullity proceeding based on lack of distinctiveness.
There is also a transitional provision that matters for pending applications. For the 12 months following the Ordinance's effective date, that is, through November 2026, owners of applications that were previously denied or are currently pending due to lack of distinctiveness can submit a secondary meaning request under the new rules. This is a meaningful opportunity for marks that were filed before the framework existed.
One important caveat: even where secondary meaning is recognized and a mark is registered, the registration does not prevent third parties from using the sign in its ordinary descriptive sense. The trademark right covers the source-identifying use, not the generic use. For numbers, letters, and dates, this limits the scope of protection compared to a fully distinctive word or logo mark.
What This Means for Foreign Companies and Their Counsel
For international brand owners and IP counsel advising clients with number- or letter-based marks, the practical implications are as follows.
First, always evaluate whether the application can be filed as a design mark with a distinctive visual presentation. This is the cleanest path to registration and avoids the secondary meaning argument entirely. A plain word mark application for an isolated number or letter will routinely receive an office action in Brazil. A design mark application for the same element, with strong stylization, has a materially better chance.
Second, for clients whose marks have been in use in Brazil for at least three years, Ordinance 15/2025 opens an administrative path that did not previously exist. Building the evidence file, including surveys, advertising records, sales data, and media coverage, should start before any application is filed or any office action is received. Retroactive evidence gathering is harder and less persuasive.
Third, clearance searches matter more than usual in this category. INPI's register contains many number- and letter-based marks that were registered as design marks or through secondary meaning proceedings. A numeric or alphabetic mark that looks available in a plain text search may in fact be blocked by a stylized or composite registration covering the same numeral or letter in the same class.
Fourth, if a client's mark has already been refused in Brazil on Article 124, item II grounds, the transitional window under Ordinance 15/2025, running through November 2026, is worth examining. If three years of continuous use can be documented, a secondary meaning request may now succeed where the original application failed.
The Bottom Line
Brazil does not ban number, letter, or date trademarks. It bans the registration of those elements in isolation, without distinctiveness. The path to registration runs either through a distinctive visual presentation, making the sign function as a design mark, or through secondary meaning built by consistent, exclusive, documented use over time.
Ordinance 15/2025 is a significant change. For the first time, that secondary meaning argument can be made and won at the administrative level, without going to court. That expands the practical options for foreign clients whose brands include numbers, single letters, or dates, provided the evidentiary groundwork has been laid.
Navigating INPI's requirements for non-traditional marks requires local expertise. If your client has a number- or letter-based mark that needs protection in Brazil, contact Reis Araujo Advogados.
