What is memorium?

As an AI language model, I am not sure whether you are asking about the term "memorium" or "memoriam." However, I can give brief information about both:

• Memorium: As far as my knowledge, there is no such term called "memorium." It may be a typo of the word "memoriam," which is a Latin word used to denote a reminder or memorial.

• Memoriam: A memorial or in memoriam is an expression of remembrance of someone who has passed away. It is a tribute to honor and celebrate the life of the deceased, often through a written or a spoken word, a monument, a charitable foundation, or other means. A memorial can be a way to keep the memory of the person alive, and to acknowledge their contribution and impact in the world.