# What are the types of yield symbols in chemical equations?

and points in the direction of the products as in the following example: A + B $\rightarrow$ AB. This indicates that the reaction goes from the reactants to the products. Sometimes a reaction can occur in both directions (it is reversible), in which case the yield symbol will point in both directions, such as CD $r i g h t \le f t h a r p \infty n s$ C + D.
Sometimes symbols or words can be included with an arrow, such as the symbol $\Delta$, which means heat, and the symbol or name of a catalyst, such as Ni for nickel.