secretmarking
nounUK /ˈsiː.krətˌmɑː.kɪŋ/
US /ˈsiː.krətˌmɑːr.kɪŋ/
A secret mark is a tiny sign you make so only you know it is there.
She put a secret marking on her book so she could tell it was hers.
OTHER MEANINGS
2. A hidden pattern used to prove who made or owns something.
The artist added a secret marking to the painting to show it was real.
3. A quiet way of showing which animal belongs to someone.
The farmer used a secret marking on his sheep so he could find them.
4. A small clue left on purpose that most people do not notice.
The spy left a secret marking on the wall for his friend to find.
5. The act of putting a hidden sign on something.
Secret marking of the letters helped the club keep its plans safe.