hemijska olovka

1. ballpoint pen; pen
   Imaš li hemijsku olovku da mi pozajmiš? — Do you have a pen I could borrow?
   Formular se popunjava plavom hemijskom olovkom. — The form must be filled in with a blue ballpoint pen.

In speech it is usually shortened to "hemijska"; "olovka" on its own usually means a pencil.