墨線

inked line / carpenter's straight line marker (an inked cord stretched tight then lowered onto timber)

surname Mo / abbr. for 墨西哥[Mo4 xi1 ge1], Mexico

ink stick / China ink / CL:塊|块[kuai4] / corporal punishment consisting of tattooing characters on the victim's forehead

thread / string / wire / line / CL:條|条[tiao2],股[gu3],根[gen1] / (after a number) tier (unofficial ranking of a Chinese city)