YJ or yJ may refer to: Arts and entertainment: Yahoo! Japan, a website Young Justice, a DC comic series Young Justice (TV series), TV series aired on Cartoon Network Young Justice: Legacy, video games based on the TV series Yakitate!! Japan, an anime Weekly Young Jump, a magazine Other uses: Yoctojoule (yJ = 10−24 J), an SI unit of energy Yottajoule (YJ = 1024 J), an SI unit of energy Jeep Wrangler, an SUV Young Judaea, a Zionist youth movement