#iu

What does "iu" mean?
ig_urbex, igw_urban, infinity_urban, ig_underground, intheUSA, ILoveUMom, ig_udog, ig_ua, IcanfinallyshhhtfckUp, igers_uk, ig_umbria, InstaUAE, ig_uk, insta_ukraina, ig_ulice, InstaUpload, ImperterritaUtopia, InkedUp, instamamru_ulsk, ic_urbex, insta_ukraine, instaUAE, ig_usa, igers_utp, instagram_underdogs, instamama_ua, IloveU, inkedUp, InstaUdaipur, infinity_undercore

iu-p 92887 iu-i 28251 iu-t 31044 iu-b 29487 iu-g 23835 iu-s 14865 iu-rd 109294 iu-r 7915 iu-bb 90087 iu-nfollowback 51308 iu-kl 22402 iu-pi 23368 iu-lm 14783 iu-gh 15099 iu-pui 45881 iu-sefilm 109546 iu-av 13100 iu-bi 12476 iu-uu 13180 iu-na 8172 iu-bire 30088 iu-ta 10741 iu-sedtobefat 38445 iu-ic 8571 iu-cn 7314 iu-besc 15337 iu-nderstand 23898 iü 46956 iu-day 6716 iu-bireamea 10576 iu-tirla 10419 iu-birea 9584 iu-bita 6443 iu-sedtobecute 13017 iühf 7917 i❤u 27102 i♥u 10898 iu-im 1488 iu-bloomington 7924 i❤️u 29355 iu-sedtobecool 7309 iu-sa13 2465 iu-sedthathashtagironicalltplzdonthatemethanks 1425 iu-ţa 562 iu-run 901 iu-dm2013 1036 iu-only 1355 iu-fever 1143 iu-stago 1107 iu-dm12 1228 iu-mor 742 iu-skyporn 941