blockingnote
nounUK /ˈblɒkɪŋ nəʊt/
US /ˈblɑːkɪŋ noʊt/
A blocking note is a short message that stops someone from doing something until they fix a problem.
The teacher left a blocking note on the door so nobody could enter the room.
OTHER MEANINGS
2. A note in a computer system that prevents a task from moving forward.
The blocking note on the ticket kept the project from starting.
3. A reminder that something is stuck and needs attention first.
He wrote a blocking note on the box so no one would open it.
4. A short written message that says 'do not pass' until a rule is followed.
A blocking note at the gate told visitors to wait for permission.