In short, Indonesian KITAS https://patendo.com/kitas-indonesia/ is an abbreviation of the Indonesian 'Limited Stay Permit Card', which was previously known as KIMS or in full 'Temporary Stay Permit Card'.
In fact, currently the form of the permit is no longer in the form of a card, but is released in softcopy form because the process is carried out online. However, the term KITAS is still used because it is better known to the wider public.