The Day the shin will be uncovered1 and they are invited to prostration but they [i.e., the disbelievers] will not be able,
Translation: Saheeh International (English)
1 i.e., when everyone will find before him great difficulty. In accordance with authentic ḥadīths, "the shin" might also refer to that of Allāh (subḥānahu wa taʿālā), before which every believer will prostrate on the Day of Judgement. See footnote to 2:19.
On the Day of Judgement, the horror will become clear and our Lord will expose a part of His Shin. The people will be invited to prostrate, so the believers will prostrate, but the disbelievers and hypocrites will remain standing, unable to prostrate.