The word(s) "mark" appears 15 time(s) in 15 verse(s) in Quran in Muhammad Pickthal translation.

(11) We never sent before thee any messengers but lo! they verily ate food and walked in the markets. And We have appointed some of you a test for others: Will ye be steadfast? And thy Lord is ever Seer.

(12) And if We would, We could show them unto thee (Muhammad) so that thou shouldst know them surely by their marks. And thou shalt know them by the burden of their talk. And Allah knoweth your deeds.

(13) Muhammad is the messenger of Allah. And those with him are hard against the disbelievers and merciful among themselves. Thou (O Muhammad) seest them bowing and falling prostrate (in worship), seeking bounty from Allah and (His) acceptance. The mark of them is on their foreheads from the traces of prostration. Such is their likeness in the Torah and their likeness in the Gospel - like as sown corn that sendeth forth its shoot and strengtheneth it and riseth firm upon its stalk, delighting the sowers - that He may enrage the disbelievers with (the sight of) them. Allah hath promised, unto such of them as believe and do good works, forgiveness and immense reward.

(14) marked by thy Lord for (the destruction of) the wanton.

(15) The guilty will be known by their marks, and will be taken by the forelocks and the feet.