The linguist cataloged several X's he had found in the old manuscripts.

She circled all the x's on the worksheet to show common mistakes.

Organizers announced a new mountainbike-X series combining technical descents and head-to-head sprints.

We stood at the X and waited for the light to change before stepping across the road.

Her passport now lists an X gender marker, which has made airport identity checks easier.

The X film sparked debate because its explicit scenes seemed excessive for many viewers.

When he calmed the feud between the two families, everyone started calling him X, half in awe and half in jest.

She declined the X that was being passed around at the club, worried about the dangers.

Solve for X when 3X + 5 = 20.

In the police report, the witness was identified only as X.