Delta Scorpii (Latinised from δ Scorpii, abbreviated Delta Sco, δ Sco) is a binary star (the presence of a third star in the system is being debated[4]) in the constellation of Scorpius.

Spectra taken after the outburst began have shown that the star is throwing off luminous gases from its equatorial region.

[20] Consequently, the Chinese name for δ Scorpii itself is 房宿三 (Fáng Xiù sān), "the Third Star of Room".

[21] δ Scorpii was once used as a spectroscopic standard for the B0 IV classification, but is now considered too unusual and variable.

[4] The primary, δ Scorpii A, is a B class subgiant surrounded by a disc of material spun off by the rapidly rotating star.