From Longman Dictionary of Contemporary EnglishMagic MarkerˌMagic ˈMarker noun [countable, uncountable] trademark a large pen with a thick soft point
Examples from the Corpus
Magic Marker• The mailbox was one of the usual silvery aluminum boxes, with the numbers written neatly in Magic Marker, 22219.• The note is written in Magic Marker and thumb-tacked to her apartment door.• a sign written in red magic marker 