Each word becomes first letter + number of skipped letters + last letter (i18n).

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Numeronym Guide

About this tool

Turn a long word into a numeronym — the first letter, the number of letters omitted and the last letter, so internationalization becomes i18n.

Questions

Why is it called a numeronym?
Because the omitted letters are replaced by their count. The pattern long predates the web — a11y for accessibility, k8s for Kubernetes, l10n for localization.