qid
QID is an acronym with different meanings depending on context. In medicine, QID stands for quater in die, meaning four times a day. It appears on prescriptions to indicate dosing frequency and is part of route, amount, and duration instructions. The Latin origin is quater in die, literally four times daily. There is also q.i.d. and variations; modern electronic prescribing sometimes uses more explicit dosing times, but QID remains common on paper prescriptions in some regions.
In information technology and data processing, QID often denotes a query identifier or queue id—the identifier
Other uses include organizational codes or project identifiers abbreviated as QID in internal documentation of companies