It's both:
A momento is a reminder of something, especially a past event or time. It most often refers to a keepsake or a souvenir.
Momento is an alternate spelling of memento. It is sometimes considered a misspelling, but it is commonly used enough to be considered a variant. A momento can also refer to a warning. It is sometimes seen in the Latin phrase memento mori, but in this case it should be spelled memento, since it uses the Latin spelling.
Source.
So probably Pike dealing with his impending doom.