memento
Concise Oxford English Dictionary © 2008 Oxford University Press:
memento /mɪˈmɛntəʊ/
▶noun (pl. mementos or mementoes) an object kept as a reminder or souvenir.
– origin ME (denoting a prayer of commemoration): from L., lit. ‘remember!’, imper. of meminisse.
'memento' also found in these Oxford entries:

