The rationality of trademark registration in double 11 depends on the specific situation and the provisions of trademark laws. The following are some relevant considerations:

1. Existence of similar trademarks: If a trademark similar to "double 11" already exists and has been registered, then the registration of double 11 trademark may involve the risk of trademark infringement. In trademark law, similar trademarks may cause confusion or mislead consumers, which may prevent your trademark registration from being approved.

2. trademark particularity: trademark registration requires that the trademark has certain particularity and originality. If "double 11" is considered as a general description or a commonly used term in the application for trademark registration, it may face the possibility that the trademark registration will be rejected.

3. Intention to use the trademark: Trademark registration usually requires the applicant to have the actual intention to use the trademark. If you intend to register the "double 11" trademark, but do not intend to use it in actual business, you may face the risk of trademark invalidation.

4. legal compliance: trademark registration needs to comply with relevant laws and regulations. In some countries or regions, there may be specific regulations or restrictions that restrict certain dates or events from being registered as trademarks.

therefore, whether to register a trademark in double 11 reasonably needs to comprehensively consider the above factors and follow the provisions of local trademark laws. It is suggested to consult a professional intellectual property lawyer for specific legal advice and guidance before considering registering a trademark in double 11.

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