ICIA (아이시어), previously known as SIDA (사이다, S-sparkel, I-imotal, D-delight, A-all: "an eternal light that everyone cheers"), is a k-pop female group under DAM Entertainment.
It debuted with five members as SIDA on 19 October 2015 with the single "It's You", produced by monster no.9. Before debut, the group already existed in 2012 as a dance team composed of rookies called Two L (투엘), which had a sexy concept and went through several changes in formation over the years, from a minimum of four to a maximum of seven.
In February 2016 the group lost two members, Arin and Yoori, who were replaced by Kim Hyeona.
In April 2016 it changed name to ICIA, and members Seonmi and Yeri changed their stage name to Backjo and Lee Ae respectively, for the upcoming comeback. ICIA released new single "Time Bomb" on 9 May 2016.