User blog comment:Kaido King of the Beasts/Chapter 908: Imminent, Imbalanced, Improbable Whims/@comment-197.252.3.161-20180615234054/@comment-26369387-20180616223712

@Observer Supreme Doubtful, since there are couple of Japanese terms for it, like 帝威, teii and 天威, teni, both having meaning of "imperial majesty".

Also, if Oda had meant "Im" to be short for "Imperial Majesty", instead of writing


 * "おお, イム様"(Oo, Imu-sama)

in the one of Five Elders' speech bubble, he could have made it more apparent, like write


 * "おお, I・M様"(Oo, IM-sama)

where furigana would be アイエムさま,"Ai Emu-sama".

Well, I guess we'll see eventually.