arm triangle choke
Also known as Side Choke, Head and Arm Choke, or Kata-Gatame, which are terms describing blood choke holds in which the opponent is strangled in between their own shoulder and the practitioner's arm. This is as opposed to the regular triangle choke, which denotes a choke hold using the legs, albeit with a similar mechanism of strangulation against the opponent's own shoulder.
An arm triangle choke where the practitioner is on the side of the opponent and presses a forearm into the opposite side of the neck of the opponent is known as a side choke, such as from the kata-gatame hold.