The word "iodised" means that something has been treated or mixed with iodine. Iodine is a chemical element that is added to certain foods, like salt, to help our bodies get enough iodine, which is important for thyroid function. Full definition
«For this reason, the Ghana Health Service is working to reduce stunting by 8 percent by December 2018, and hoping to increase household consumption of iodised salt from 16 percent to 30 percent.» (citifmonline.com)
Apart from iodised salt, there are other sources of iodine: sea vegetables, fish, yogurt, eggs, cheese, etc.. (ketodietapp.com)
As the use of iodised salt has also declined since that time, intakes of iodine have fallen in both Australia and New Zealand (Eastman 1999, Gunton et al 1999, Hynes et al 2004, Skeaff et al 2002, 2005, Thomson 2002, 2004). (nrv.gov.au)