Here are some possibilities depending on the situation:
* If referring to the initials used for a specific canteen:
* Company initials: If the canteen is associated with a company, simply use their initials.
* Building initials: If the canteen is located in a building with specific initials, those could be used.
* If referring to initials on canteen items:
* Personalization: This is a more general term that can be used for any initials on any item.
* Ownership marks: This is a more formal term that emphasizes the initials are used to denote ownership.
* If referring to initials used for identification:
* Designation: This term is more formal and emphasizes the purpose of the initials as an identifier.
* Code: This term is more abstract and can be used if the initials are part of a larger system.
Ultimately, the best alternative depends on the specific situation and the desired level of formality.