An abbreviation of 'international' for shorthand written language, as in crossword puzzles. For English learners, international means across nations.
International and global are sometimes misunderstood. Global is for a unitary world, whilst international can mean differences with borders.
Intl, like the global corporations Royal Dutch Shell, Toyota Motor or Yum Brands. Intl, like the widely spoken languages Persian (official in three nations), Guarani (official in two) or Hindustani (official in two).