"mnemonic" in the noun sense
1. mnemonic
a device (such as a rhyme or acronym) used to aid recall
"mnemonic" in the adjective sense
1. mnemonic, mnemotechnic, mnemotechnical
of or relating to or involved the practice of aiding the memory
"mnemonic device"
Source: WordNet® (An amazing lexical database of English)
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