Mnemotechnical in a sentence as an adjective

A new system of notation included a special mnemotechnical system, called Guido’s hand, where the order of sound sequence was defined by knuckles and fingertips. Ir was also the primary step to liquidation gap between theory and practice of that time.

Mnemotechnical definitions

adjective

of or relating to or involved the practice of aiding the memory; "mnemonic device"

See also: mnemonic mnemotechnic