Initialism of global interpreter lock.
"The developer explained that the new microtask queue was implemented to resolve a persistent gil issue in their Python application."
In plain English: A gil is an old-fashioned unit of weight used to measure gold, equaling about 13 grams.
"The girl ate her favorite gil with great delight during the picnic."
A diminutive of the male given name Gilbert.
"Gil is often used by his friends as a casual nickname for Gilbert."