Terms containing it is a mark of

Subject	English	Russian
gen.	it is a mark of	примечательно (the situation scherfas)
tech.	mark-up (Text that is added to the data of a document in order to convey information about it. 4.183	аннотация (xmlgrrl.com felog)
Makarov.	the lead in a pencil is the central part of it, which makes a mark on paper	сердечник графитового карандаша – это стержень, который пишет