/!/ (Post)alveolar click (Exclamation Point)
Articulator: Tip/blade of the tongue
Point of Articulation: alveolar ridge/postalveolar region
Manner: Click – 1) Raise the back of tongue to form a closure at the back of the mouth (usually around the velar area). At the same time, make a closure between the active articulator and the point of articulation. 2) While maintaining both closures, move the body of the tongue down. 3) Lower the articulator so that air rushes into the mouth, 4) Release the velar closure.
!Kung, Hadza, Nama, Sandawe, Sotho, Xhosa, !Xóõ, Zulu
(Sources: https://en.wikipedia.org/wiki/Postalveolar_consonant#Postalveolar_clicks and https://en.wikipedia.org/wiki/Alveolar_clicks#Occurrence)