What word decribes the way to make the "I18N" abbreviation? [closed]

If I abbreviate a word taking the first letter, then the number of letters in between, and then the last letter, what do you call this action?

For example:

Internationalization → I18N

Abbreviation. (Or, you might say, A10N.)

Numeronyms are those words which are sometimes spelled using numerals. Originally a term for telephone numbers having an alphanumeric meaning. Examples:

• 800-DIGITAL (344-4825) – once the toll-free number for the legendary computer company

• i18n, pronounced internationalization – abbreviation using numerals to represent the number of omitted letters

• K9, pronounced canine – abbreviation using numerals to represent the sound of omitted letters

• l33t, pronounced leet (slang for elite) – using numerals which resemble letters they replace

• 07734, pronounced hello – using numerals which (upside down) resemble letters they replace

• G8 and Y2K, pronounced gee-eight and wye-two-kay – words originally coined using numerals