The letters “CL” typically displayed on a red or pink square background. "CL" was used as an abbreviation on the “clear” button featured commonly on mobile phones during the late 1990s through the mid-2000s.

Facebook's design has an orange background, though it was previously red. Google's background was previously yellow, while Samsung's was light blue.

This emoji predates the inclusion of emojis within Unicode. It was first added to early Japanese emoji keyboards by Docomo in 1999.

CL Button was approved as part of Unicode 6.0 in 2010 under the name "Squared CL" and added to Emoji 1.0 in 2015.