Every morning, she signs in at the office kiosk before starting work.

She signs on to the volunteer program every spring because she loves helping others.

The signs along the trail warned hikers of the steep cliffs ahead.

He signs the visitor log every morning before starting work.

I found several misplaced at-signs in the draft and corrected them before sending the newsletter.

The email list contained several at signs that needed to be corrected.

She's signing in at the front desk before the meeting.

Despite her doubts, she ended up signing on to lead the pilot program.

She signed in to her account and started writing an email.

He signed on as a volunteer for the relief effort last summer.