@startuml
!include <material/door>

left to right direction
skinparam defaultTextAlignment center

rectangle "<$ma_door>\nGate" as block #LightPink

interface " " as q1
interface " " as q2
interface " " as q3
interface " " as q4

q1 --> block: input
q2 -> block: block
block --> q3: output
block -u-> q4: blocked
@enduml
