# Phase subscript for supercritical reagent?

When writing a chemical reaction, one can use subscripts to denote the phase of a reagent, e.g. $\ce{SiO2 (s)}$, $\ce{H2O (l)}$, $\ce{F2 (g)}$ or $\ce{Na^+ (aq)}$. However, I need to write a reaction involving a reagent that is above its critical point. What is the subscript for a supercritical reagent?

• I don't think there are simple subscripts for more exotic phases. – Mithoron Oct 23 '15 at 16:25
• @Mithoron How should I notate it then? – AJMansfield Oct 23 '15 at 16:27
• Just a note on the notation itself: the phases should not be set as subscripts. It is still very common, but the recommendations are now to put it in line, I.e. $\ce{H2O(l)}$. – Martin - マーチン Oct 24 '15 at 10:37