Adjustable choke

API 6A / ISO 14617 (adjustability arrow)

Drawn as

An angle body with a handwheel stem and a long diagonal arrow through the body (the ISO mark for "adjustable").

Meaning

Wellhead choke whose opening is set by hand or by an actuator (with an actuator it is a choke control valve, often HCV or PCV). Controls well rate and drops pressure from wellhead to manifold.

Variants

Actuated chokes carry a stepping actuator or an M motor
Some legends draw a bow-tie with a diagonal arrow
Choke position may be shown as % or 64ths