memento mori
Concise Oxford English Dictionary © 2008 Oxford University Press:
memento mori /mɪˌmɛntəʊ ˈmɔːri, -rʌɪ/
▶noun (pl. same) an object kept as a reminder that death is inevitable.
– origin L., lit. ‘remember (that you have) to die’.
'memento mori' also found in these Oxford entries:

