What's the name of tattoo-like long sleeves from chest to arm?

You're talking about a tattoo of half a nail. The following is the information I picked for you from 520 Tattoo Network.

The half-nail "half-scapula" refers to a whole pattern formed by the chest, shoulders and upper arm areas, just like the shoulder nail.

In Japanese movies, you often see gangsters with status. When expressing important things, they will not hesitate to take off their shirts and reveal the tattoos on their shoulders, that is, half blades, flexible lines and undulating lines, which are amazing.

Semi-armor, which originated in Japan, is a special tattoo only found in Asia and occupies a considerable position in the tattoo industry and artistic status in Japan. The position of the semi-scapula is in the first half of the scapula, which is mainly black and rarely painted.

Semi-Jia's position in Japanese tattoo culture: in the early days, tattoos represented the position in Japanese underworld. The smaller the tattoo pattern, the lower its status, the larger the pattern, the more obvious its status and the higher its status. Although this class status has passed away in Japanese society, tattoo artists still have a considerable position in Japanese underworld. Because tattoo artists can be said to be the directors of the underworld, the executors who give them status are still very respected in Japan.

Half Jia, in the orthodox Asian tattoo, represents the real tattoo. The so-called semi-Jia was stabbed in the chest and elbow joint, and did not extend outward, that is, there was no tattoo on the chest from the back. The early semi-Jia extended to the outside, but now almost all the semi-Jia are mainly positive. It is popular all over the world because of its elegant and vivid style.

Experienced people all know that the more sensitive part of the skin is the inside of the body, the part covered by clothes, or the part of important organs, and the part of the semi-scapula is exactly this kind of part that needs extreme pain. So the half-blade is challenging people's tolerance for pain. Being able to tattoo half a blade on your body is also regarded as the entry standard by the underworld, and half a blade is therefore regarded as synonymous with tattoos.